FGDC Classic | FGDC FAQ | FGDC Plus | XML

Connecticut Bedrock Geology Polygon

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publication_Date: 1985
Title:
Connecticut Bedrock Geology Polygon
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Hartford, Connecticut, USA
Publisher: State of Connecticut, Department of Environmental Protection
Other_Citation_Details:
The data source for this layer is the Bedrock Geological Map of Connecticut, Rodgers, 1985. The map is published at 1:125,000 scale. The layer was digitized from 1:50,000-scale compilation sheets for the 1:125,000-scale Bedrock Geological Map of Connecticut.
Online_Linkage: http://www.ct.gov/deep
Larger_Work_Citation:
Citation_Information:
Originator: John Rodgers, Compiler
Publication_Date: 1985
Title:
Bedrock Geology of Connecticut
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Hartford, Connecticut
Publisher: Connecticut Geological and Natural History Survey, Connecticut Department of Environmental Protection in cooperation with the U.S. Geological Survey
Other_Citation_Details:
The Bedrock Geology of Connecticut map is published at 1:125,000 scale and is available for purchase at the Connecticut DEP Store.
Online_Linkage: http://www.ct.gov/deep
Online_Linkage: http://cteco.uconn.edu/map_catalog/maps/state/Bedrock_Geologic_Map_of_Connecticut.pdf
Online_Linkage: http://www.usgs.gov
Description:
Abstract:
Connecticut Bedrock Geology is a 1:50,000-scale, polygon and line feature-based layer describing the solid material that underlies the soil or other unconsolidated material of the earth for Connecticut. Bedrock geologic formations are described as polygons in terms of formation name (incorporating geologic age), rock type, and tectonic terrane association. Tectonic forces are responsible for the present day geologic configuration of the continents. Resulting terranes are regionally fault bounded rocks of a similar tectonic history. Each terrane is named after its plate tectonics ancestry. Geologic lines include contacts, faults, and terrane boundaries. Terrane boundaries are named for the faults involved. The geologic contacts and faults are delineated and classified by type. Polygon feature attribute information is comprised of codes to identify individual bedrock geologic units, their formation name, description and size. Line feature attributes identify, name and describe bedrock contacts, faults and terrane boundaries between these bedrock geologic units. Data is compiled at 1:50,000 scale and is not updated. A complete description of the bedrock mapping units with mineralogical descriptions and a brief history of Connecticut geology are included in the Supplemental Information Section for reference.

The data source is from John Rodgers, Bedrock Geological Map of Connecticut, 1985 (Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2 sheets, 1:125,000 publication scale). This datalayer was digitized from a set of 1:50,000 scale regional sheets used for compilation of the 1:125,000 scale published map. The regional sheets were compiled to a common publication base from 1:24,000 scale mylar originals prepared from geologic quadrangle mapping and other interpretations. A list of sources is included later in this document. Additional historical information is in the map notes section. For a stratigraphic correlation of bedrock units, major regional and statewide tectonic structures, and cross sectional views of the State's geology, please refer to the 1:125,000 scale Bedrock Geological Map of Connecticut. The Bedrock Geological Map of Connecticut is available for purchase at the DEP Store.
Purpose:
Connecticut Bedrock Geology is 1:50,000-scale data suitable for for geologic and environmental mapping and analysis purposes. Not intended for maps printed at map scales greater or more detailed than 1:50,000 scale (1 inch = 4,167  feet.). Not intended for site specific spatial analysis purposes.
Supplemental_Information:
Brief Bedrock Geologic History of Connecticut - Geologic regions (terranes) on this map reflect the role of plate tectonics in the geologic history of Connecticut. Each terrane is named after its plate tectonics history.

From 450 to 250 million years ago, during the Paleozoic Era, several crustal plates, including Africa and Eurasia, sequentially collided with the Proto-North American plate in a series of four mountain building events that ultimately created the Appalachian Mountains and the supercontinent Pangea. During these  collisions, Avalonia, a small continent believed to have been a part of the African plate, was thrust against the continent of Proto-North America, closing and collapsing the intervening Iapetos Ocean. The collisions deformed and metamorphosed both the continental rocks of Proto-North America and Avalonia and the oceanic rocks and sediments of the Iapetos Ocean floor. This process created the schists, gneisses and granites exposed today in eastern and western Connecticut. Features of these metamorphic and igneous rocks show this complex geologic history, confirming the continental and oceanic origins and the processes of plate tectonics.

Shortly after the collision ended, at the beginning of the Mesozoic Era or about 235 million years ago, plate tectonic processes reversed. Pangea began to break apart, initiating the opening of the Atlantic Ocean and leaving Avalonia welded to North America. In the early stages of this breakup, rift basins formed along and on both sides of the zone where the Atlantic Ocean finally opened. The Newark terrane in central Connecticut is the eroded remnant of one of these rift basins. It contains 200 million year old sedimentary rocks (brownstone) and lava flows and intrusions of basalt (trap rock).

Geologic Ages - Below is a list of Geologic ages represented in Connecticut rocks. The first letter represents the geologic age, which is the first portion of each bedrock unit code.

AGE CODE, GEOLOGIC AGE, DATE (mya = million years ago)

J, Jurassic, 140 - 205 mya, Youngest rocks in Connecticut
TR, Triassic, 205 - 240 mya
P, Permian, 240 - 290 mya
Carboniferous rocks (Pennsylvanian and Mississippian) are not present in Connecticut 
290 - 360 mya
D, Devonian, 360 - 410 mya
S, Silurian, 410 - 435 mya
O, Ordovician, 435 - 500 mya
C, Cambrian, 500 - 570 mya
Z, Proterozoic (PreCambrian), 570 - 800 mya
Y, Proterozoic (PreCambrian), 800 - 1700 mya, 'Y' Proterozoic are the oldest rocks in Connecticut (~ 1100 mya)

Simplified descriptions are given for rock terms used above. Descriptions include general and distinguishing characteristics of rocks as they commonly occur in Connecticut.

Alaskite gneiss: Light-colored, fine-to coarse-grained, banded metamorphic rock of granite-like composition with potassium feldspar as the major feldspar, and only a few percent dark minerals.

Amphibolite: Dark-colored, fine-to coarse-grained, massive to poorly layered metamorphic rock containing amphibole and plagioclase with little or no quartz.

Arkose: Red to brown, medium-to coarse-grained, sandstone-like, sedimentary rock containing quartz, feldspar, and rock fragments. It is the most common sedimentary rock of the Central Lowlands; locally known as brownstone. Brownstone was quarried for use as building stone.

Basalt: Dark-gray, orange-to brown-weathering, fine-grained, extrusive igneous rock, commonly fractured (jointed), containing calcium-plagioclase and pyroxene; occurs as lava flows in the Central Lowlands; locally known as traprock. Basalt is extensively quarried for use as crushed stone.

Diorite: Light and dark (salt and pepper), medium- to coarse-grained intrusive igneous rock, commonly massive-appearing, generally lacking layering or banding; composed primarily of plagioclase feldspar, quartz and dark minerals.

Dioritic gneiss: Light and dark, medium- to coarse-grained, compositionally banded metamorphic rock of dioritic composition.

Dolerite: Dark-gray, orange- to brown- to gray-weathering, medium- to fine-grained intrusive igneous rock, commonly fractured into well-developed columnar joints, compositionally similar to basalt; occurs as dikes and sills in both the lowlands and uplands; locally known as traprock. Dolerite is quarried for use as crushed stone.

Gabbro: Dark, medium- to coarse-grained, intrusive mafic igneous rock, commonly massive-appearing, generally lacking layering or banding; composed primarily of clinopyroxene and plagioclase; often altered.

Gneiss: Light and dark, medium- to coarse-grained metamorphic rock characterized by compositional banding of light and dark minerals, typically composed of quartz, feldspar, and various amounts of dark minerals; occurs with a variety of compositions and is a characteristic rock of the uplands.

Granite: Light-colored, medium- to very coarse-grained intrusive igneous rock, commonly massive-appearing, lacking layering or banding; composed of quartz, feldspar, and commonly muscovite mica with minor amounts of dark minerals. Granite and granitic gneiss were quarried for use as dimension stone. Very limited quarrying continues.

Granitic gneiss: Light-colored, medium- to coarse-grained, compositionally banded metamorphic rock of granitic composition. Quarried for use as dimension stone (see granite).

Granofels: Light to dark, medium- to coarse-grained, massive to poorly layered metamorphic rock composed primarily of quartz and feldspar; lacking the compositional banding of a gneiss.

Greenschist: Light to dark, green, medium- to coarse-grained schist; typically consisting of the green minerals: chlorite, epidote, or actinolite.

Greenstone: Green to gray-green, fine- to coarse-grained, massive to poorly layered metamorphic rock composed of chlorite, hornblende, and epidote.

Lamprophyre: Dark-colored, medium-grained intrusive igneous rock occurring as dikes; composed of biotite, hornblende, pyroxene, and feldspars or feldspathoids.

Mafic rock: Dark-colored rock consisting of one or more dark (iron and magnesian) minerals as its major constituent.

Marble: Conspicuously white, or gray, medium- to coarse-grained, massive to layered metamorphic rock composed of calcite and/or dolomite. It is a metamorphosed limestone and underlies several major valleys in the Western Uplands. Marble is quarried for use as agricultural lime and for industrial uses.

Mylonite: Compact rock with streaky or banded structure, found in fault zones, and produced by extreme crushing and shearing of rocks during movement of a fault. It is particularly well developed along the Lake Char - Honey Hill fault zones of the Eastern Uplands.

Norite: Dark-colored, medium- to coarse-grained intrusive mafic igneous rock commonly massive-appearing, lacking layering or banding, composed of plagioclase and orthopyroxene; often altered.

Pegmatite: Light-colored, very coarse-grained intrusive igneous rock, composed of feldspar, quartz, and micas; frequently can be seen in highway roadcuts as light-colored parallel and cross cutting veins and lenses in the metamorphic rock of the uplands; occasionally is a host for gem minerals. Pegmatite is a common and economically important rock type in Connecticut. It occurs in bodies too small to show on a state-scale geologic map. The Branchville area of western Connecticut and the Middletown area of eastern Connecticut have pegmatites of particular significance.

Phyllite: Silvery, gray to dark-gray, fine- to very fine-grained, schist-like metamorphic rock.

Porphyry: Light-colored, fine-grained intrusive igneous rock with some conspicuously large crystals of quartz, feldspar, or biotite.

Quartzite: Light-colored to gray, massive to layered, medium-grained metamorphic rock. Very hard and resistant; a metamorphosed sandstone composed primarily of quartz.

Shale: Red to brown, locally gray to green, extremely fine-grained, strongly layered sedimentary rock composed of clay minerals; occurs in the Central Lowlands.

Schist: Light, silvery to dark, coarse- to very coarse-grained, strongly to very strongly layered metamorphic rock whose layering is typically defined by parallel alignment of micas. Primarily composed of mica, quartz, and feldspar; occasionally spotted with conspicuous garnets.

Schistose marble: Light-colored, fine- to coarse-grained, marble interlayered with schist or phyllite.

Syenite: Medium-gray, fine- to coarse-grained intrusive igneous rock, commonly massive-appearing, generally lacking layering or banding, composed primarily of potassium feldspar with minor dark minerals but little quartz.

Ultramafic rock: Dark-colored, medium- to coarse-grained intrusive igneous rock, commonly massive-appearing, generally lacking layering or banding and originally composed chiefly of olivine and pyroxene; commonly altered to serpentine and talc. Occurs as small intrusions in the uplands.
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1985
Currentness_Reference:
publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -73.742107
East_Bounding_Coordinate: -71.781365
North_Bounding_Coordinate: 42.052612
South_Bounding_Coordinate: 40.949970
Keywords:
Theme:
Theme_Keyword_Thesaurus: None
Theme_Keyword: geology
Theme_Keyword: bedrock
Theme_Keyword: lithology
Theme_Keyword: rock type
Theme_Keyword: geologic Age
Theme_Keyword: geologic history
Theme_Keyword: formation name
Theme_Keyword: geologic terrane
Theme_Keyword: plate tectonics
Theme_Keyword: mineralogy
Theme_Keyword: geologic sources
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: geoscientificInformation
Place:
Place_Keyword_Thesaurus: U.S. Department of Commerce, 1987, Codes for the Identification of the States, the District of Columbia and the Outlying Areas of The United States, and Associated Areas (Federal Information Processing Standard 5-2): Washington, DC, National Institute of Standards and Technology.
Place_Keyword: Connecticut
Place_Keyword: CT
Place:
Place_Keyword_Thesaurus: U.S. Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions (Federal Information Processing Standard (FIPS) 10-4): Washington, D.C., National Institute of Standards and Technology.
Place_Keyword: United States of America
Place_Keyword: USA
Access_Constraints: None. The data is in the public domain and may be redistributed.
Use_Constraints:
No restrictions or legal prerequisites for using the data. The data is suitable for use at appropriate scale, and is not intended for maps printed at scales greater or more detailed than 1:50,000 scale (1 inch = 4,167 feet). Although this data set  has been used by the State of Connecticut, Department of Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Environmental Protection as to the accuracy of the data and or related materials.  The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata. When printing this data on a map or using it in a software application, analysis, or report, please acknowledge the State of Connecticut, Department of Environmental Protection as the source for this information. For example, include the following data source description when printing this layer on a map: Geology - From the Bedrock Geology layer, compiled and published by CT DEP and USGS. Source map scale is 1:50,000.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Department of Environmental Protection
Contact_Person: Margaret Thomas
Contact_Address:
Address_Type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State_or_Province: Connecticut
Postal_Code: 06106-5127
Country: USA
Contact_Voice_Telephone: 860-424-3540
Contact_Facsimile_Telephone: 860-424-4058
Contact_Electronic_Mail_Address: dep.gisdata@ct.gov
Hours_of_Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Browse_Graphic:
Browse_Graphic_File_Name: http://www.cteco.uconn.edu/metadata/dep/browsegraphic/bedrockgeologypolyfullview.gif
Browse_Graphic_File_Description:
Full view of Bedrock Geology - Bedrock Geology Polygon features symbolized by the (geologic) UNIT attribute
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: http://www.cteco.uconn.edu/metadata/dep/browsegraphic/bedrockgeologypolylinedetailview.gif
Browse_Graphic_File_Description:
Detail view of Bedrock Geology and Bedrock Contacts - Bedrock Geology Polygon features symbolized by the (geologic) UNIT together with Bedrock Geology Line features symbolized by CLASS_COD attribute values.
Browse_Graphic_File_Type: GIF
Browse_Graphic:
Browse_Graphic_File_Name: http://www.cteco.uconn.edu/metadata/dep/browsegraphic/bedrockgeologypolylinefullviewterrane.gif
Browse_Graphic_File_Description:
Full view of Geologic Terrane - Bedrock Geology Polygon features symbolized by the Geologic Terrane (TERRANE) attribute together with Bedrock Geology Line features symbolized by the Terrane Boundary (TERR_BNDRY) attribute.
Browse_Graphic_File_Type: GIF
Data_Set_Credit:
The compiler, John Rodgers, wishes to acknowledge his great debt to all the many geologists who have worked on the bedrock geology of the State over the years. But perhaps his deepest indebtedness is to the Report on the Geology of the State of Connecticut and the accompanying Geological Map of Connecticut published in 1842 by James Gates Percival. Connecticut had far less forest (or urban sprawl) and far more open country (fields and pastures) in Percival's day than ours, so that he almost certainly saw many more outcrops than anyone since; he was, moreover, an extraordinarily accurate observer with a retentive memory, so that his tracing of rock units from one part of the state to another is thoroughly reliable. His map is almost certainly more accurate than either subsequent geological map of the State (Gregory and Robinson 1906; Rodgers, Cameron, Gates, and Ross, 1956), but it is hardly usable because the map units are designated only by letters, numbers, Greek letters, and symbols keyed to the difficulty readable text. In more than one place, the compiler chose among diverse interpretations on the basis of Percival's mapping.

The compiler must further point out that, in order to produce a map consistent with itself and also with the Bedrock Geologic Map of Massachusetts (Zen and others, 1983), which was being compiled at the same time, he felt it necessary to depart significantly in some places from the source maps cited, as by using different units, correlating units differently, and occasionally introducing or suppressing contacts or faults. In those places of course the authors of the source materials are not responsible for the interpretation shown on this map within the quadrangles for which they are cited. In some cases, indeed, they strongly disagree with the compiler's reinterpretation, for which he must take the entire responsibility.

This compilation was begun at the suggestion of Joe Webb Peoples, then State Geologist. His persistence and encouragement helped carry the map through draft and redraft. Sidney Quarrier coordinated much of the work and brought the map to print two times; first a preliminary version at the scale of 1:250,000 in 1982, and now the final colored map at 1:125,000. He and his coworkers Robert Altamura and Margaret Thomas designed the format and material for this map. Nancy Davis, Craigh Dietsch, and Nat Gibbons drafted the original compilation.
Native_Data_Set_Environment:
These data are maintained by the State of Connecticut using ArcGIS software developed by Environmental Systems Research Institute (ESRI) in a Microsoft Windows operating system environment.
Back to Top
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The Bedrock Geology layer retains the feature types and information identified on the 1:50,000-scale compilation sheets for the Bedrock Geological Map of Connecticut, Rodgers, 1985. All attributes have valid values. Values are within defined domains. The accuracy test for the UNIT attribute values was conducted by comparing the Geologic Map Unit information presented on the source mylar overlays with 1:50,000-scale check plots or interactive displays of the digital data on a computer graphic system. These check plot maps and computer displays depicted and labeled the Bedrock Geology polygon features in different colors and line-fill patterns based on UNIT attribute values for comparison with the original data source. FORMATION is the English language equivalent of (decodes) the UNIT field values. The FORMATION, DESCRIPTION, TERR_COD, TERRANE, LITH01, LITHO2, LITHO3, LITHO4, LITHO5, AGE, and TIME polygon attributes are all based on and key off the UNIT attribute. These related attributes were populated by joining to lookup data tables using the UNIT as the relate key field instead of manually entering these values for each polygon feature. These lookup data tables contain records that account for and describe the unique occurrences of UNIT. The AREA_SQMI (area in square miles) and ACREAGE (area in acres) field were automatically calculated for each polygon feature based on computer generated feature area in square feet. For line features, the CLASS_COD attribute that distinguishes faults from contacts, for example, was manually entered for each feature. DEFINITION is the English language equivalent of (decodes) the CLASS_COD field values. The DEFINITION, AV_LEGEND, TERRB_COD, and TERR_BNDRY line attributes are all based on and key off the CLASS_COD attribute. These related line attributes were populated by joining to lookup data tables using the CLASS_COD as the relate key field instead of manually attributing these values for each line feature.
Logical_Consistency_Report:
Polygon features conform to the following topological rules. Polygons are single part. There are no duplicate polygons. Polygons do not self overlap. Polygons do not overlap other polygons. Lines are single part. Line features conform to the following topological rules. There are no duplicate lines. Lines do not self overlap. Lines do not overlap other lines. Lines intersect only at nodes, and nodes anchor the ends of all lines. Lines do not overshoot or undershoot other lines they are supposed to meet and intersect. The tests of logical consistency were performed by the State of Connecticut using ESRI ArcInfo software to maintain feature topology in ArcInfo coverage format. The data is topologically clean. The ArcInfo Clean function was repeatedly used following edits to verify topology and enforce a minimum distance between vertices of 4 feet (fuzzy tolerance) and a minimum allowed overshoot length of 10 feet (dangle length).
Completeness_Report:
The data completely reflects the content of the data sources, which is a set of 1:50,000 scale regional map (mylar) sheets used for compilation of the Bedrock Geological Map of Connecticut, 1985 (Connecticut Geological and Natural History Survey, DEP, in cooperation with the U.S. Geological Survey, 2 sheets, 1:125,000 publication scale). The Bedrock Geology datalayer was digitized from this set of 1:50,000 scale mylar compilation sheets that mapped the Bedrock Geology for the State of Connecticut. This data is not updated.
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
The horizontal positional accuracy of this data is unknown.
Lineage:
Source_Information:
Source_Citation:
Citation_Information:
Originator: Connecticut Geological and Natural History Survey, Department of Environmental Protection, State of Connecticut (CGNHS)
Originator: United States Geological Survey, Department of the Interior (USGS)
Originator: New York State Museum Map and Chart Series, Education Department, State of New York (NYSMMC)
Originator: Unpublished manuscript including theses and manuscripts by various authors
Publication_Date: varies according to source material
Title:
Source Materials (listed by 7.5 minute quad)
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: varies according to source material
Publisher: varies according to source material
Other_Citation_Details:
Source materials include geologic quadrangle maps, quarangle reports, reports of investigations, open file reports, unpublished manuscripts including theses, and guidebooks.
Source_Scale_Denominator: 24000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1951
Ending_Date: 1985
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 1 - Source Materials (listed by quad)
Source_Contribution:
SOURCE MATERIALS used in compiling the Bedrock Geological Map of Connecticut, 1985, listed by 7.5' quadrangle.

Amenia - Geol. Map of N.Y., NYSMMC 15, 1970
Ansonia - Fritts, GQ 426, 1965
Ashaway - Feininger, GQ 403, 1965
Ashley Falls - Ratcliffe, USGS OF 75-148
Avon - Schnabel, GQ 134, 1960
Bashbish Falls - Zen and Hartshorn, GQ 507, 1966
Bayville - No bedrock exposed
Bethel - Clarke, ms. (CGNHS)
Botsford - Heyl, ms. (CGNHS)
Branford - Sanders, ms. (CGNHS); Rodgers, ms. (Yale)
Brewster - Prucha, Scotford, and Sneider, NYSMMC 11, 1968; Geol. Map of N.Y., NYSMMC 15, 1970
Bridgeport - Crowley, QR 24, 1968
Bristol - Simpson, ms. (USGS)
Broad Brook - Colton, GQ 434, 1965
Clinton - Lundgren and Thurrell, QR 29, 1973
Colchester - Lundgren and Snyder, QR 27, 1971
Collinsville - Stanley, QR 16, 1964
Columbia - Snyder, GQ 592, 1967
Cornwall - Gates, QR 11, 1961
Danbury - Clarke, QR 7, 1958
Danielson - Dixon, GQ 696, 1968
Deep River - Lundgren, QR 13, 1963; London, ms. (CGNHS-1985, in prep.)
Dover Plains - Carroll, ms. (Yale); Jackson, ms. (U. Mass.)
Durham - Simpson, USGS OF, 1969; de Boer, ms. (CGNHS); Steinen, ms. (U. Conn.)
Eastford - Pease, GQ 1023, 1973
East Killingly - Moore, GQ 1571, 1983
Ellington - Collins, QR 4, 1954
Ellsworth - Burr, ms. (U. Mass.)
Essex - Lundgren, QR 15, 1964
Fitchville - Snyder, USGS Bull. 1161-1, 1964
Glastonbury - Herz, QR 5, 1955
Glenville - Hall, ms. (CGNHS)
Guilford - Bernold, Loilis, de Neufville, mss. (Yale)
Haddam - Lundgren, QR 37, 1979
Hamburg - Lundgren, QR 19, 1966
Hampden - Peper, GQ 1368, 1977
Hampton - Dixon and Pessl, GQ 468, 1966
Hartford North - Cushman, GQ 223, 1963
Hartford South - Weitz, Byrnes, mss. (CGNHS)
Jewett City - Dixon, ms. (USGS).*
Kent - Jackson, ms. (U. Mass) and (CGNHS)
Litchfield - Gates, QR 1, 1951
Long Hill - Crowley, QR 24, 1968
Mamaroneck - Pellegrini, NYSMMC 29, 1977; Hall, ms. (U. Mass.)
Manchester - Colton, GQ 433, 1965
Marlborough - Snyder, GQ 791, 1969
Meriden - Hanshaw, GQ 738, 1968
Middle Haddam - Eaton and Rosenfeld, USGS OF, 1972; London, ms. (CGNHS-1985, in prep.)
Middletown - Lehmann, QR 8, 1959
Milford - Fritts, GQ 427, 1965
Millerton - Geol. Map of N.Y., NYSMMC 15, 1970
Monson - Peper, GQ 1374, 1977
Montville - Goldsmith, GQ 609, 1967
Moodus - Lundgren and Ashmead, QR 27, 1971
Mount Carmel - Fritts, GQ 199, 1963
Mount Kisco - Hall, ms. (U. Mass.)
Mystic - Goldsmith, USGS OF 75-602
Naugatuck - Cary, QR 9, 1960
New Britain - Simpson, GQ 494, 1966
New Hartford - Schnabel, GQ 1257, 1975
New Haven - Burger, RI 4, 1967; Sanders, ms. (CGNHS); Rodgers, ms. (Yale) New London - Goldsmith, GQ 574, 1967
New Milford - Caldwell, ms. (U. Mass.)
New Preston - Gates, QR 2, 1952; Dana, ms. (U. Mass.)
Newtown - Stanley, QR 33, 1976
Niantic - Goldsmith, GQ 575, 1967
Norfolk - Harwood, GQ 1518, 1979
Norwalk North - Kroll, QR 34, 1977
Norwalk South - Kroll, QR 34, 1977
Norwich - Snyder, GQ 144, 1961
Old Lyme - Lundgren, QR 21, 1967
Old Mystic - Goldsmith, ms. (USGS)
Oneco - Harwood and Goldsmith, GQ 930, 1971
Oxford - Dixon, ms. (USGS); Barosh, USGS OF 76-622
Pawling - Geol. Map of N.Y., NY StMus MandC 15, 1970
Peach Lake - Prucha, Scotford, and Sneider, NYSMMC 11, 1968
Plainfield - Dixon, GQ 481, 1965
Pound Ridge - Hall, ms. (U. Mass.)
Putnam - Dixon, GQ 1562, 1982
Rockville - Aitken, QR 6, 1955; Pease, ms. (USGS)
Roxbury - Gates, GQ 121, 1959
Scotland - Dixon and Shaw, GQ 392, 1965
Sharon - Gates, QR 38, 1979
Sherwood Point - Dieterich, ms. (CGNHS)
Southbridge - Moore, USGS OF 78-220
Southbury - Scott, QR 30, 1974
South Canaan - Gates, QR 32, 1975; Harwood, ms. (USGS)
South Coventry - Fahey and Pease, USGS OF 77-584; Snyder, ms. (USGS); Wintsch, ms. (U. Ind.)
Southington - Fritts, GQ 200, 1963
South Sandisfield - Harwood, GQ 1519, 1979
Southwick - Schnabel, GQ 1170, 1974
Springfield South - Hartshorn and Koteff, GQ 678, 1967
Spring Hill - Pease, Snyder, Dixon, mss. (USGS); Wintsch, ms. (U. Ind.)
Stafford Springs - Pease, USGS OF 75-633; Pease, GB 5, 1982
Stamford - Frank, ms. (CGNHS)
Tariffville - Schnabel and Eric, GQ 370, 1965
Thomaston - Cassie, ms. (CGNHS)
Thompson - Dixon, GQ 1165, 1974
Tolland Center - Harwood, Ratcliffe, mss. (USGS)
Torrington - Martin, QR 25, 1970
Uncasville - Goldsmith, GQ 576, 1967
Voluntown - Feininger, GQ 436, 1965
Wales - Seiders, GQ 1320, 1976
Wallingford - Sanders, rns. (CGNHS); King, Rodgers, mss. (Yale)
Watch Hill - Moore, GQ 655, 1967
Waterbury - Gates and Martin, QR 22, 1967; Dietsch, ms. (Yale)
Webster - Barosh, USGS OF 74-192; Dixon, ms. (USGS)
Westford - Peper and Pease, GQ 1214, 1975
West Granville - Schnabel, USGS OF, 1973
Westport - Dieterich, ms. (CGNHS)
West Springfield - Colton and Hartshorn, GQ 537, 1966
West Torrington - Gates and Christensen, QR 17, 1965; Merguerian, ms. (CUNY)
Willimantic - Snyder, GQ 335, 1964
Windsor Locks - Schnabel and Eric, GQ 388, 1964
Winsted - Martin, ms. (CGNHS); Harwood, ms. (USGS)
Woodbury - Gates, QR 3, 1954; Schutz, Naruk, mss. (Yale)
Woodmont - Rodgers, ms. (Yale); Sanders, ms. (CGNHS)

ABBREVIATIONS
CGNHS - Connecticut Geological and Natural History Survey, Department of Environmental Protection, State of Connecticut
GB - Guidebook, Connecticut Geological and Natural History Survey
GQ - Geologic Quadrangle map, U.S. Geological Survey
ms. - Unpublished manuscript including theses
mss. - Separate unpublished manuscripts by individual authors listed
NYSMMC - New York State Museum Map and Chart Series, Education Department, State of New York
OF - Open file report, U.S. Geological Survey
QR - Quadrangle Report, Connecticut Geological and Natural History Survey
RI - Report of Investigations, Connecticut Geological and Natural History Survey
USGS - United States Geological Survey, Department of the Interior
Source_Information:
Source_Citation:
Citation_Information:
Originator: Connecticut Geological and Natural History Survey, Department of Environmental Protection, State of Connecticut (CGNHS)
Originator: United States Geological Survey, Department of the Interior (USGS)
Originator: New York State Museum Map and Chart Series, Education Department, State of New York (NYSMMC)
Originator: Unpublished manuscript including theses and manuscripts by various authors
Publication_Date: varies according to source material
Title:
Source Materials (listed by author)
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: varies according to source material
Publisher: varies according to source material
Other_Citation_Details:
Source materials include geologic quadrangle maps, quarangle reports, reports of investigations, open file reports, unpublished manuscripts including theses, and guidebooks.
Source_Scale_Denominator: 24000
Type_of_Source_Media: paper
Source_Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 1951
Ending_Date: 1985
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 1 - Source Materials (listed by author)
Source_Contribution:
SOURCE MATERIALS used in compiling the Bedrock Geological Map of Connecticut, 1985, listed by author.

PUBLISHED REFERENCES CITED
Aitken, J.M., 1955, The bedrock geology of the Rockville quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 6, 55 p., map.
Burger, H.R., 1967, Stratigraphy and structure of the western part of the New Haven quadrangle, Connecticut: Conn. Geo . Nat. History Survey Rept. Invs. 4, 15 p., map.
Carr, M.H., 1960, The bedrock geology of the Naugatuck quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 9, 25 p., map.
Clarke, J.W., 1958, The bedrock geology of the Danbury quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 7, 47 p., map.
Collins, G.E., 1954, The bedrock geology of the Ellington quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 4, 44 p., map.
Colton, R.B., 1965a, Geology of the Manchester quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-433.
Colton, R.B., 1965b, Geology of the Broad Brook quadrangle: U.S. Geol. Survey Geol.Quad@ Map GQ-434.
Colton, R.B., and Hartshorn, J.H., 1966, Bedrock geology of the West Springfield quad- rangle: U.S. Geol. Survey Geol. Quad. Map GQ-537.
Crowley, W.P., 1968, The bedrock geology of the Long Hill and Bridger)ort quadrangles: Conn. Geol. Nat. History Survey Quad. Rept. 24, 81 p., maps.
Cushman, R.V., 1963, Geology of the Hartford North quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-223.
Dixon, H.R., 1965, Bedrock geology of the Plainfield quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-481.
Dixon, H.R., 1968, Bedrock geology of the Danielson quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-696.
Dixon, H.R., 1974, Bedrock geology of the Thompson quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ- 1 165.
Dixon, H.R., 1982, Bedrock geologic map of the Putnam quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-1562.
Dixon, H. R., and Pessi, Fred, Jr., 1966, Geology of the Hampton quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-468.
Dixon, H.R., and Shaw, C.E., Jr., 1965, Geology of the Scotland quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-392.
Emerson, B.K., 1898, Geology of old Hampshire County, Massachusetts, comprising Franklin, Hampshire, and Hampden Counties: U.S. Geol. Survey Mon. 29, 790 p.
Emerson, B.K., 1917, Geology of Massachusetts and Rhode Island: U.S. Geol. Survey Bull. 597, 289 p.
Feininger, Tomas, 1965a, Bedrock geology of the Ashaway quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-403.
Feininger, Tomas, 1965b, Bedrock geology of the Voluntown quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-436.
Fisher, D.W., Isachsen, Y.W., and Rickard, L.V., 1970, Geologic map of New York, Lower Hudson sheet: New York State Mus. Map and Chart Ser. 15.
Fritts, C.E., 1963a, Bedrock geology of the Mount Carmel quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-199.
Fritts, C.E., 1963b, Bedrock geology of the Southington quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-200.
Fritts, C.E., 1965a Bedrock Geology of the Ansonia quadrangle: U.S. Geol. Survey Geol. Quad.Map GQ-426.
Fritts, C.E., 1965b, Bedrock geology of the Milford quadrangle: U.S. Geol. Survey Geol.Quad. Map GQ-427.
Gates, R.M., 1951, The bedrock geology of the Litchfield quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 1, (Misc. Ser. 3), 13 p., map.
Gates, R.M., 1954, The bedrock geology of the Woodbury quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 3, 32 p., map.
Gates, R.M., 1959, Bedrock geology of the Roxbury quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-121.
Gates, R.M., 1961, The bedrock geology of the Cornwall quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 11, 35 p., map.
GaLes, R.M., 1975, The bedrock geology of the South Canaan quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 32, 33 p., map.
Gates, R.M., 1979, The bedrock geology of the Sharon quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 38, 24 p., map.
Gates, R.M., and Bradley, W.C., 1952, The geology of the New Preston quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 2, (Misc. Ser. 5) 46 p., maps.
Gates, R.M., and Christensen, N.I., 1965, The bedrock geology of the West Torrington quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 17, 38 p., map.
Gates, R.M., and Martin, C.W., 1967, The bedrock geology of the Waterbury quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 22, 36 p., map.
Goldsmith, Richard, 1967a, Bedrock geology of the New London quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-574.
Goldsmith, Richard, 1967b, Bedrock geology of the Niantic quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-575.
Goldsmith, Ricbard, 1967c, Bedrock geology of the Uncasville quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-576.
Goldsmith, Richard, 1967d, Bedrock geology of the Montville quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-609.
Gregory, H.E., and Robinson, H.H., 1907, Preliminary geological map of Connecticut: Survey Geol. Quad. Map GQ-574.
Goldsmith, Richard, 1967b, Bedrock geology of the Niantic quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-575.
Goldsmith, Ricbard, 1967c, Bedrock geology of the Uncasville quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-576.
Goldsmith, Richard, 1967d, Bedrock geology of the Montville quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-609.
Gregory, H.E., and Robinson, H.H., 1907, Preliminary geological map of Connecticut: Conn. Geol. Nat. History Survey Bull. 7, 39 p., map [map is dated 19061.
Hanshaw, P.M., 1968, Bedrock geology of the Meriden quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-738.
Hartshorn, J.H., and Koteff, Carl, 1967, Geology of the Springfield South quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-678.
Harwood, D.S., 1979a, Bedrock geology of the Norfolk quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-1518.
Harwood, D.S., 1979b, Geology of the South Sandisfield quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-1519.
Harwood, D.S., and Goldsmith, Richard, 1971, Geology of the Oneco quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-930.
Herz, Norman, 1955, The bedrock geology of the Glastonbury quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 5, 22 p., map.
Kroll, R.L., 1977, The bedrock geology of the Norwalk North and Norwalk South quad- rangles: Conn. Geol. Nat. History Survey Quad. Rept. 34, 64 p., maps.
Krynine, P.D., 1950, Petrology, stratigraphy, and origin of the Triassic sedimentary rocks of Connecticut: Conn. Geol. Nat. History Survey Bull. 73, 239 p.
Lehman,p, E.P., 1959, The bedrock geology of the Middletown quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 8, 40 p., map.
Lundgren, Lawrence, Jr., 1963, The bedrock geology of the Deep River quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 13, 40 p., map.
Lundgren, Lawrence, Jr., 1964, The bedrock geology of the Essex quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 15, 37 p., map.
Lundgren, Lawrence, Jr., 1966, The bedrock geology of the Hamburg quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 19, 41 p., map.
Lundgren, Lawrence, Jr., 1967, The bedrock geology of the Old Lyme quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 21, 30 p., map.
Lundgren, Lawrence, Jr., 1979, The bedrock geology of the Haddam quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 37, 44 p., map.
Lundgren, Lawrence, Jr., Ashmead, Lawrence, and Snyder, G.L., 1971, The bedrock geology of the Moodus and Colchester quadrangles: Conn. Geol. Nat. History Survey Quad. Rept. 27, 24 p., maps.
Lundgren, Lawrence, Jr., and Thurrell, R.F., 1973, The bedrock geology of the Clinton quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 29, 22 p., map.
Martin, C.W., 1970, The bedrock geology of the Torrington quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 25, 53 p., map.
Moore, G.E., Jr., 1967, Bedrock geology of the Watch Hill quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-655.
Moore, G.E., Jr., 1983, Bedrock geologic map of the East Killingly quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-1571.
Pease, M.H., Jr., 1973, Geology of the Eastford quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-1023.
Pease, M.H., 1982, The Bone Mill Brook fault, eastern Connecticut: in New England lntercoll. Geol. Conf., 74th Ann. Mtg., Univ. of Connecticut: Connecticut Geol. Nat. History Survey Guidebook 5, Trip P-2.
Pelligrini, T.L., 1977, Bedrock geology of the Mamaroneck quadrangle: New York State Mus. Map and Chart Ser. 29.
Peper, J.D., 1977a, Bedrock geology of the Hampden quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-1368.
Peper, J.D., 1977b, Bedrock geology of the Monson quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-1374.
Peper, J. D., and Pease, M.H., Jr., 1975, Geology of the Westford quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-1214.
Percival, J.G., 1842, Report on the geology of the State of Connecticut: New Haven, 495 p., map.
Prucha, J.J., Scotford, D.M., and Sneider, R.M., 1968, Bedrock geology of parts of Putnam and Westchester Counties, New York, and Fairfield County, Connecticut: New York State Mus. Map and Chart Set. 11, 26 p., map.
Rodgers, John, Cameron, E.N., Gates, R.M., and Ross, R.J., Jr., 1956, Preliminary geological map of Connecticut: Conn. Geol. Nat. History Survey.
Schnabel, R.W., 1960, Bedrock geology of the Avon quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-134.
Schnabel, R.W., 1974, Bedrock geology of the Southwick quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ- 1 170.
Schnabel, R.W., 1975, Geology of the New Hartford quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-1257.
Schnabel, R.W., and Eric, J.H., 1964, Bedrock geology of the Windsor Locks quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-388.
Schnabel, R.W., and Eric, J.H., 1965, Bedrock geology of the Tarriffville quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-370.
Scott, R.B., 1974, The bedrock geology of the Southbury quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 30, 63 p., map.
Sciders, V.M., 1976, Bedrock geology of the Wales quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-1320.
Simpson, H.E., 1966, Bedrock geology of the New Britain quadrangle: U.S. Geol. Survey Geol.. Quad. Map GQ-494.
Snyder, G.L., 1961, Bedrock geology of the Norwich quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-144.
Snyder, G.L., 1964a, Petrochemistry and bedrock geology of the Fitchville quadrangle: U.S. Geol. Survey Bull. 1161-1, 63 p., map.
Snyder, G.L., 1964b, Bedrock geology of the Willimantic quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-335.
Snyder, G.L., 1967, Bedrock geology of the Columbia quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-592.
Snyder, G.L., 1969, Bedrock geology of the Marlborough quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-791.
Stanley, R.S., 1964, The bedrock geology of the Collinsville quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 16, 99 p., map.
Stanley, R.S., 1976, The bedrock geology of the Newtown quadrangle: Conn. Geol. Nat. History Survey Quad. Rept. 33, 44 p., map.
Zen, E-an, ed., Goldsmith, Richard, Ratcliffe, N.M., Robinson, Peter, and Stanley, R.S., compilers, 1983, Bedrock geologic map of Massachusetts: Reston, Va., U.S. Geo- logical Survey, scale 1:250,000, 3 sheets.
Zen, E-an, and Hartshorn, J.H., 1966, Geology of the Bashbish Falls quadrangle: U.S. Geol. Survey Geol. Quad. Map GQ-507.

ADDITIONS
Dixon, H.R., and Felmlee, J.K., (in press), Bedrock geologic map of the Jewett City quadrangle: U.S. Geological Survey Geol. Quad. Map GQ-1575.
Goldsmith, Richard, 1985, Bedrock geologic map of the Old Mystic and part of the Mystic quadrangles: U.S. Geological Survey Misc. Inv. Ser. Map 1-1524.
Source_Information:
Source_Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection
Publication_Date: 1985
Title:
Compilation Sheets
Geospatial_Data_Presentation_Form: map
Publication_Information:
Publication_Place: Hartford, Connecticut, USA
Publisher: State of Connecticut, Department of Environmental Protection
Source_Scale_Denominator: 50000
Type_of_Source_Media: transparency
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1985
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 2 - Regional Compilation Sheets
Source_Contribution:
1:50,000-scale mylar overlay compilation sheets used to publish the Bedrock Geological Map of Connecticut, 1985. 
Source_Information:
Source_Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publication_Date: 1985
Title:
Connecticut Bedrock Geology
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Hartford, Connecticut, USA
Publisher: State of Connecticut, Department of Environmental Protection
Online_Linkage: http://www.ct.gov/deep
Source_Scale_Denominator: 50000
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1985
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 3 - Bedrock Geology Layer
Source_Contribution:
Bedrock Geology Layer is in ArcInfo coverage format having both polygon and line features.
Source_Information:
Source_Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publication_Date: 1985
Title:
Connecticut Bedrock Geology Polygon
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Hartford, Connecticut, USA
Publisher: State of Connecticut, Department of Environmental Protection
Online_Linkage: http://www.ct.gov/deep
Source_Scale_Denominator: 50000
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1985
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 4 - Bedrock_Geology_Poly.shp
Source_Contribution:
Includes all polygon features from Source 3 - Bedrock Geology (ArcInfo Coverage format). Bedrock Geology_Polygon.shp is in Shapefile format.
Source_Information:
Source_Citation:
Citation_Information:
Originator: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publication_Date: 1985
Title:
Connecticut Bedrock Geology Polygon
Geospatial_Data_Presentation_Form: vector digital data
Publication_Information:
Publication_Place: Hartford, Connecticut, USA
Publisher: State of Connecticut, Department of Environmental Protection
Online_Linkage: http://www.ct.gov/deep
Source_Scale_Denominator: 50000
Type_of_Source_Media: disc
Source_Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 1985
Source_Currentness_Reference:
publication date
Source_Citation_Abbreviation:
Source 5 - Bedrock_Geology_Poly
Source_Contribution:
Bedrock_Geology_Poly is in GeoDatabase Feature Class format.
Process_Step:
Process_Description:
Compilation - Original compilations at 1:24,000 scale under the direction of John Rodgers, Yale University, were prepared from existing geologic quadrangle mapping and other interpretations (see Source 1 - Source Materials). 1:50,000-scale regional mylars were compiled by the Connecticut Geological and Natural History Survey to resolve mapping differences between adjacent 1:24,000 scale sheets and were used as a common publication base to produce the final map. Connecticut Geological and Natural History Survey contractors and staff manually digitized regional compilations sheets.

Topographic bases used in the original geologic compilation from USGS 1:24,000 scale revisions 1952-1970.

Compilation bases, and publication preparation by the Connecticut Department of Environmental Protection from U.S. Geological Survey 1:50,000 scale County Map Series. Base map contour intervals and other features are specific to individual county maps. There are 7 regional compilation areas divided into Northeast, North Central, Northwest, Central West, South Central, Southeast, and Southwest sheets. These are defined along 41 degrees, 15 minutes; 41 degrees, 15 minutes, 30 seconds of latitude and 73 degrees; 72 degrees, 22 minutes, 30 seconds of longitude.
Source_Used_Citation_Abbreviation:
Source 1 - Source Materials (listed by quad)
Source_Used_Citation_Abbreviation:
Source 1 - Source Materials (listed by author)
Process_Date: Unknown
Source_Produced_Citation_Abbreviation:
Source 2 - Regional Compilation Sheets
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: John Rodgers, Compiler with assistance from Robert Altamara, Nancy Davis, Craigh Dietsch, Nat Gibbons, Sidney Quarier, Margaret Thomas
Contact_Organization: State of Connecticut, Department of Environmental Protection
Contact_Address:
Address_Type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State_or_Province: Connecticut
Postal_Code: 06106
Country: USA
Contact_Voice_Telephone: 860-424-3540
Process_Step:
Process_Description:
Digital Automation - Bedrock geology digital data were produced by the Connecticut Geological and Natural History Survey, Connecticut Department. of Environmental Protection with support from the U.S. Geological Survey, the U.S. Environmental Protection Agency, and the Connecticut Department of Public Health. Using ESRI ArcInfo software, features were digitized by registering each 1:50,000-scale source map to the digitizing tablet and using the crosshairs of the digitizer's mouse to manually capture the geometry (location) of features drafted on the map. The (rectangular) area mapped on each 1:50,000-scale source map is defined by a set of 7.5-minute quadrangle areas. Mapped at 1:50,000-scale, the corners of USGS 7.5 minute topographic quadrangle maps are used as registration points and are depicted on the source map. The source map was registered to the digitizing tablet by digitizing (entering) the locations of four outermost quadrangle corner registration points shown on the map. ArcInfo software compared the values of the digitized coordinates with the actual (true) values for the quadrangle corner (tic) features. The Root Mean Square (RMS) error generated by the ArcInfo software indicated the amount of error involved in transforming coordinates from the registered map to the digital layer. Typically, RMS errors higher than 0.004 are not acceptable and required re-registering the source map by digitizing the tic locations again. The actual RMS values were not documented, but are assumed to be within acceptable range. With a correct registration, individual polygon boundary features were manually digitized off the source map. Polygon features were assigned UNIT values to denote the Bedrock Geology Unit, and line features were assigned CLASS_COD and TERRB_COD to denote geographic boundaries, contacts and faults. Where necessary, additional minor corrections (edits) to feature geometry were manually digitized on the screen (heads-up digitizing) at display scales greater than 1:24,000. Features were assigned attribute values based on information shown on the 1:50,000-scale compilation sheets. Feature location and attribute accuracy was visually checked and inspected by symbolizing and labeling features according to UNIT, CLASS_COD and TERRB_COD attribute values on the computer screen and on hard copy paper maps in order to verify the accuracy of the manually encoded attribute values. These check plot maps were printed at the same scale as the source maps in order to visually inspect digitizing quality and the assignment of attribute values. Digitzing each 1:50,000-scale sheet resulted in the creation of an ArcInfo coverage having both polygon and line features. All ArcInfo coverages where subsequently appended to create the statewide Bedrock Geology layer in ArcInfo Coverage format. Throughout this process, the ArcInfo Clean function was repeatedly used following edits to verify topology and enforce a minimum distance between vertices of 4 feet (fuzzy tolerance) and a minimum allowed overshoot length of 10 feet (dangle length). Additional attributes were added to the statewide layer by joining the corresponding lookup tables to polygon and line features.
Source_Used_Citation_Abbreviation:
Source 2 - Regional Compilation Sheets
Process_Date: 2000
Source_Produced_Citation_Abbreviation:
Source 3 - Bedrock Geology Layer
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Department of Environmental Protection
Contact_Person: Margaret Thomas
Contact_Address:
Address_Type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State_or_Province: Connecticut
Postal_Code: 06106
Country: USA
Contact_Voice_Telephone: 860-424-3540
Process_Step:
Process_Description:
Export to Shapefile Format - Converted polygon feature data from ArcInfo Coverage named BEDROCK to a Shapefile named Bedrock_Geology_Poly.shp. Excluded the AREA, PERIMETER, BEDROCK#, BEDROCK-ID attributes from the Shapefile because their values are only maintained by ArcInfo software with data that is in ArcInfo Coverage format.
Source_Used_Citation_Abbreviation:
Source 3 - Bedrock Geology Layer
Process_Date: 20051206
Source_Produced_Citation_Abbreviation:
Source 4 - Bedrock_Geology_Poly.shp
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Deparment of Environmental Protection
Contact_Person: Howie Sternberg
Contact_Address:
Address_Type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State_or_Province: Connecticut
Postal_Code: 06106
Country: USA
Contact_Voice_Telephone: 860-424-3540
Process_Step:
Process_Description:
Convert to GeoDatabase Feature Class format - Defined new Feature Class named Bedrock_Geology_Poly; and imported the attribute definitions, loaded features and imported metadata from Bedrock_Geology_Poly.shp shapefile. 

Spatial Reference Properties for Feature Class:

Coordinate System: NAD_1983_StatePlane_Connecticut_FIPS_0600_Feet
XY Domain MinX: 100000; MaxX: 2247483.645
XY Domain MinY: 200000; MaxY: 2347483.645
Precision: 1000
Source_Used_Citation_Abbreviation:
Source 4 - Bedrock_Geology_Poly.shp
Process_Date: 20061106
Source_Produced_Citation_Abbreviation:
Source 5 - Bedrock_Geology_Poly
Process_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Department of Environmental Protection
Contact_Person: Howie Sternberg
Contact_Address:
Address_Type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State_or_Province: Connecticut
Postal_Code: 06106
Country: USA
Contact_Voice_Telephone: 860-424-3540
Back to Top
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference_Method:
State of Connecticut, United States of America
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 1892
Back to Top
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
Lambert Conformal Conic
Standard_Parallel: 41.200000
Standard_Parallel: 41.866667
Longitude_of_Central_Meridian: -72.750000
Latitude_of_Projection_Origin: 40.833333
False_Easting: 999999.999996
False_Northing: 499999.999998
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.000250
Ordinate_Resolution: 0.000250
Planar_Distance_Units: survey feet
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222
Vertical_Coordinate_System_Definition:
Altitude_System_Definition:
Altitude_Resolution: 1.000000
Altitude_Encoding_Method: Explicit elevation coordinate included with horizontal coordinates
Back to Top
Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: Connecticut Bedrock Geology Polygon
Entity_Type_Definition:
Bedrock Geology map units represented as polygon features.
Entity_Type_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute:
Attribute_Label: OBJECTID
Attribute_Definition:
Internal feature number.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: SHAPE
Attribute_Definition:
Feature geometry.
Attribute_Definition_Source:
ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Coordinates defining the features.
Attribute:
Attribute_Label: UNIT
Attribute_Definition:
Geologic Unit - Represents the map unit symbol for bedrock geology polygon features. Upper case letters in the map unit represent the geologic age of the formation. Lower case letters in the map unit represent the formation. Map units (Geological Formations) with more than one upper case letter denote a geologic age range represented by the formation (i.e. DSts, The Straits Schist, denotes Devonian and Silurian aged rock unit). Use of the question mark indicates uncertainty about the age or the identification of the geologic formation. For example: D?d denotes uncertainty about the designation of D (Devonian) for the age of the geologic formation. Jb? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit. C is used for the Cambrian age rocks ~ 500 mya - 570 mya. There are no Cretaceous age rocks in Connecticut.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Cc
Enumerated_Domain_Value_Definition:
Cheshire Quartzite (Lower Cambrian) - Mainly pure, white, glassy, tough quartzite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Cd
Enumerated_Domain_Value_Definition:
Dalton Formation (including Poughquag Quartzite and Lowerre Formation) (Lower Cambrian and perhaps partly older) - Gray, tan-weathering, medium grained, generally well layered gneiss or feldspathic quartzite, composed of quartz, microcline, plagioclase, muscovite, biotite, and generally tourmaline; some schistose micaceous layers have sillimanite, commonly as quartz-sillimanite nodules rimmed with muscovite. Layers of purer quartzite in many areas, especially near the top or where the formation is thin
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ce
Enumerated_Domain_Value_Definition:
Everett Schist (Cambrian?) - Grayish to greenish (some rusty-weathering), fine-to medium-grained, foliated but poorly layered schist or phyllite, composed or quartz, albite or oligoclase, muscovite, garnet, staurolite or chloritoid, and generally chlorite. Local layers are dark-gray to silvery schist or phyllite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ch
Enumerated_Domain_Value_Definition:
Hoosac Schist (Cambrian?) - Light-to medium-gray, rusty-weathering, fine- to medium-grained schist and poorly layered schistose gneiss, composed of quartz, biotite, plagioclase, muscovite, and generally garnet and sillimanite or kyanite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Cm
Enumerated_Domain_Value_Definition:
Manhattan Schist (including Waramaug Formation and Canaan Mountain Schist) - (Cambrian?) - Dark-gray to silvery, rusty-weathering, generally coarse grained, foliated but poorly layered to massive gneiss or schistose gneiss, composed of quartz, oligoclase, microcline, biotite, and muscovite, and generally sillimanite and garnet. Amphibolite layers locally, especially near base where in places separately mapped as unit Cma
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Cma
Enumerated_Domain_Value_Definition:
Amphibolite-bearing unit of Manhattan Schist (Cambrian?) - Like Manhattan Schist but with numerous lenses and layers of amphibolite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Cmcl
Enumerated_Domain_Value_Definition:
Lower slice of Canaan Mountain Schist (Cambrian?) - Dark-gray, rusty-weathering, coarse-grained, well-foliated and moderately well layered schist composed of quartz, plagioclase, biotite, muscovite, and generally garnet and sillimanite (or minor staurolite). Amphibolite layers rather rare
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Cmcu
Enumerated_Domain_Value_Definition:
Upper slice of Canaan Mountain Schist (Cambrian?) - Dark-gray to silvery, generally rusty weathering, medium- to coarse-grained, well-foliated, massive to well-layered schist and schistose gneiss, composed of quartz, plagioclase, biotite, muscovite, and generally garnet and sillimanite; also layers of amphibolite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Cmcub
Enumerated_Domain_Value_Definition:
Basal member of upper slice of Canaan Mountain Schist (Cambrian?) - Gray, generally rusty- or tan-weathering gneiss, composed of quartz, plagioclase, microline, biotite, and muscovite, interlayered with feldspathic quartzite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Csa
Enumerated_Domain_Value_Definition:
Unit a [of Stockbridge Marble] (Lower Cambrian) - White to pale-gray, massive, smooth-weathering dolomite marble
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Csb
Enumerated_Domain_Value_Definition:
Unit b [of Stockbridge Marble] (Upper and Middle? Cambrian) - White, pink, cream, and light-gray, generally well-bedded dolomitic marble interlayered with phyllite and schist and with siltstone, sandstone, or quartzite, commonly dolomitic
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Csc
Enumerated_Domain_Value_Definition:
Unit c [of Stockbridge Marble] (Upper Cambrian) - Gray, generally massive dolomite marble, commonly contains quartz grains, locally beds of sandstone; may be calcitic near top
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Cwb
Enumerated_Domain_Value_Definition:
Waterbury Gneiss (Proterozoic Z or Cambrian or both) - Medium- to dark-gray, fine- to medium-grained, generally irregularly foliated and lenticular rather than regularly layered schist and schistose gneiss, composed of biotite, quartz, oligoclase, kyanite (or sillimanite), and garnet, also locally microcline, irregularly mixed with granitoid gneiss, composed of oligoclase or andesine, quartz, biotite, and commonly microcline and muscovite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: D?d
Enumerated_Domain_Value_Definition:
Foliated quartz diorite (Devonian in part, probably Ordovician in part) - Mainly dark-gray, medium-grained, well-foliated gneiss (locally strongly sheared, especially near contacts), composed of plagioclase, quartz, biotite, and hornblende, locally also pyroxene (? denotes uncertainty about the designation of D (Devonian) for the age of the geologic formation).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: DSs
Enumerated_Domain_Value_Definition:
Scotland Schist (Devonian or Silurian or both) - Gray to silvery, locally rusty, fine- to medium-grained schist, composed of quartz, muscovite, biotite, staurolite, and oligoclase, locally with kyanite or sillimanite; interlayered, especially below and to the west, with quartz-oligoclase-biotite schist and granofels and locally with quartzite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: DSsq
Enumerated_Domain_Value_Definition:
Quartzite unit [in Scotland Schist] (Devonian or Silurian or both) - Quartzite, generally micaceous, interlayered with mica schist
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: DSt
Enumerated_Domain_Value_Definition:
The Straits Schist (= Goshen Formation of Massachusetts) (Devonian or Silurian or both) - Silvery to gray, non-rusty, coarse- to very coarse grained, generally poorly layered schist, composed of quartz, muscovite, biotite, oligoclase, garnet, and commonly staurolite and kyanite or sillimanite; graphitic almost throughout
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: DSts
Enumerated_Domain_Value_Definition:
Southington Mountain Member [of The Straits Schist] (Devonian or Silurian or both) - Gray to silvery, non-rusty, medium-grained, well-layered alternating schist and granofels, composed of quartz, oligoclase, muscovite, biotite, and garnet, commonly with staurolite and kyanite (or sillimanite); schist commonly graphitic
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: DSw
Enumerated_Domain_Value_Definition:
Wepawaug Schist (Devonian or Silurian or both) - Medium- to dark-gray, medium- to fine-grained, well-layered schist or phylite and metasiltstone, composed of quartz, muscovite or sericite, plagioclase, biotite, and in appropriate metamorphic zones chlorite, garnet, staurolite, and kyanite. Schist or phyllite generally graphitic
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dbl
Enumerated_Domain_Value_Definition:
Littleton Formation (Devonian) - Gray to silvery, generally non-rusty, medium-grained, massive to well-layered alternating schist and micaceous quartzite, composed of quartz, muscovite, biotite, garnet, and oligoclase, also staurolite, graphite, and ilmenite, and in certain areas kyanite or sillimanite in schist
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dbl?
Enumerated_Domain_Value_Definition:
Littleton Formation - see Dbl (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dblm
Enumerated_Domain_Value_Definition:
Mount Pisgah Member of Littleton Formation (Devonian) - Gray, medium-grained, well-layered (locally graded) granofels or micaceous quartzite with some schist, composed of quartz, oligoclase, biotite, garnet, and sillimanite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dc
Enumerated_Domain_Value_Definition:
Canterbury Gneiss (may be equivalent to Ayer Granite of Massachusetts) (Devonian) - Light-gray, medium-grained, variably foliated, locally strongly lineated gneiss, composed of quartz, oligoclase, microcline, and biotite, locally also muscovite or epidote, and generally with megacrysts 1 to 2 cm long of either or both feldspars
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dce
Enumerated_Domain_Value_Definition:
'Eastford gneiss phase' [of Canterbury Gneiss] (Devonian) - Mainly light gray, medium-grained, foliated to strongly lineated gneiss, composed of quartz, microcline, oligoclase or albite, biotite, and muscovite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: De
Enumerated_Domain_Value_Definition:
Erving Formation (Devonian) - Gray, medium-grained, well-foliated and generally well layered granofels and schist, composed of quartz, plagioclase, and biotite, also muscovite in schist, and accessory garnet and kyanite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dgg
Enumerated_Domain_Value_Definition:
Foliated granitic gneiss (Devonian?) - Light-gray, coarse-grained, strongly to weakly foliated gneiss, composed of phenocrysts of K-feldspar in a groundmass of plagioclase, quartz, K-feldspar, and biotite, with accessory sillimanite and garnet
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dl
Enumerated_Domain_Value_Definition:
Lebanon Gabbro (Devonian) - Dark, speckled, coarse-grained, massive but locally sheared gabbro, composed of hornblende, labradorite, and opaques. Some bodies contain biotite and quartz; some smaller ones are nearly pure hornblende with local augite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dld
Enumerated_Domain_Value_Definition:
Dioritic phase [of Lebanon Gabbro] (Devonian) - White to black, streaked, medium-grained, foliated or sheared gneiss, composed of plagioclase, biotite, quartz, and generally hornblende
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dlp
Enumerated_Domain_Value_Definition:
Lamprophyre (Devonian?) - Dark-gray to greenish, fine-grained, badly altered dike rock, composed of biotite, augite, K-feldspar, and accessory apatite and sphene, plus secondary minerals
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dm
Enumerated_Domain_Value_Definition:
Maromas Granite Gneiss (Devonian?) - Light-gray to buff, medium- to fine-grained granitic gneiss, composed of quartz and microcline with minor plagioclase and biotite. Central body is massive, but outlying strips are foliated and have accessory hornblende or garnet. Massive parts may be young anatectic intrusive rocks; foliated parts may include older felsic metavolcanic rocks belonging to unit Ochv. Pegmatite bodies are common in the vicinity
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dn
Enumerated_Domain_Value_Definition:
Hornblende norite (Devonian?) - Dark, coarse-grained, massive rock, composed of bytownite, hornblende, and hypesthene
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dng
Enumerated_Domain_Value_Definition:
Nonewaug Granite (Devonian) - White to pink, fine- to very coarse grained (commonly pegmatitic), massive to layered granite composed of albite, microcline, quartz, and muscovite, with minor biotite and garnet. Microcline commonly graphic; quartz and muscovite commonly in plumose aggregates
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jb
Enumerated_Domain_Value_Definition:
Buttress Dolerite (Middle? Jurassic) - Dark-gray to greenish-gray (weathers brown or gray), medium- to fine-grained, commonly porphyritic, generally massive with well-developed columnar jointing, grading from basalt near contacts to fine-grained gabbro in the interior, composed of plagioclase and pyroxene with accessory opaques and locally devitrified glass, quartz, or olivine
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jb?
Enumerated_Domain_Value_Definition:
Buttress Dolerite - see Jb (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jeb
Enumerated_Domain_Value_Definition:
East Berlin Formation (Lower Jurassic) - Maroon siltstone, silty and sandy shale, and fine-grained silty sandstone, generally well laminated and commonly well indurated, alternating with dark fissile shale; dolomitic carbonate common in cement, concretions, and thin argillaceous laminae. Local arkose; grades eastward into coarse conglomerate close to eastern border fault
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jha
Enumerated_Domain_Value_Definition:
Hampden Basalt (Lower Jurassic) - Greenish-gray to black (weathers bright orange to brown), fine- to medium-grained, grading from basalt near contacts to fine-grained gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jho
Enumerated_Domain_Value_Definition:
Holyoke Basalt (Lower Jurassic) - Greenish-gray to black (weathers bright orange to brown), fine- to coarse-grained, grading from basalt near contacts to gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jp
Enumerated_Domain_Value_Definition:
Portland Arkose (Lower Jurassic) - Reddish-brown to maroon micaceous arkose and siltstone and red to black fissile silty shale. Grades eastward into coarse conglomerate (fanglomerate) 'Meriden Formation' of Krynine (1950) (Lower Jurassic)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jsi
Enumerated_Domain_Value_Definition:
Silicified rock and mylonite along Mesozoic faults (probably mainly Jurassic) - Close network of quartz veins and veinlets cutting each other and older rock, which is mostly replaced by very fine grained quartz. In places, incompletely replaced rock shows strongly mylonitic texture.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jsm
Enumerated_Domain_Value_Definition:
Shuttle Meadow Formation (Lower Jurassic) - Maroon to dark-gray, silty shale, siltstone, and fine-grained silty sandstone, generally well and thinly laminated. In the southern part of the State includes a layer, up to 5 m thick, of blue, commonly sandy, fine-grained limestone or dolomitic limestone, grading laterally into calcareous siltstone. Coarser and more arkosic to east and south, grading into conglomerate near the eastern border fault
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jta
Enumerated_Domain_Value_Definition:
Talcott Basalt (Lower Jurassic) - Greenish-gray to black (weathers bright orange to brown), fine- to medium-grained, grading from basalt near contacts to fine-grained gabbro in the interior, composed of pyroxene and plagioclase with accessory opaques and locally olivine or devitrified glass. Pillows in may places; volcanic breccia with fragmentary pillows in others
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jwr
Enumerated_Domain_Value_Definition:
West Rock Dolerite (Lower Jurassic) - Dark-gray to greenish-gray (weathers bright orange to brown), medium- to fine-grained, grading from basalt near contacts to fine-grained gabbro in the interior, generally massive with well-developed columnar jointing, composed of plagioclase and pyroxene with accessory opaques and locally devitrified glass, quartz, or olivine
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jwr?
Enumerated_Domain_Value_Definition:
West Rock Dolerite - see Jwr (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: OCr
Enumerated_Domain_Value_Definition:
Rowe Schist (Lower Ordovician or Cambrian or both) - Light-gray to silvery, fine- to medium-grained, generally poorly layered schist composed of quartz, muscovite, biotite, oligoclase, and generally garnet, staurolite, and kyanite or sillimanite. Layers of granofels common; also some layers of amphibolite, quartz-spessartine rock (coticule), and calc-silicate rock
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: OCr+OCra
Enumerated_Domain_Value_Definition:
 Rowe Schist and Amphibolite unit in Rowe Schist undivided -  see OCr and OCra
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: OCr?
Enumerated_Domain_Value_Definition:
Rowe Schist - see OCr (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: OCs
Enumerated_Domain_Value_Definition:
Stockbridge Marble (including Inwood Marble (Lower Ordovician and Cambrian) - White to gray, massive to layered marble, generally dolomitic but containing calcite marble in upper part, locally interlayered with schist or phyllite and with calcareous siltstone or sandstone
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Oa
Enumerated_Domain_Value_Definition:
Allingtown Metavolcanics (Middle? Ordovician) - Green, fine-grained, massive greenstone, composed of epidote, actinolite, albite, and chlorite, commonly with abundant megacrysts of saussurite, interlayered with minor green phyllite, generally containing quartz and sericite. Dark amphibole in western outcrops
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Oa+Oma
Enumerated_Domain_Value_Definition:
 Allingtown Metavolcanics and Maltby Lakes Metavolcanics undivided -  see Oa and Oma
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ob
Enumerated_Domain_Value_Definition:
Brookfield (dioritic and granodioritic) Gneiss (including Newtown Gneiss of Crowley, 1968) (Middle? Ordovician) - Dark and light, commonly speckled or banded, medium- to coarse-grained, massive to poorly foliated gneiss, composed of plagioclase, biotite, and hornblende, generally with quartz and K-feldspar, the latter commonly as megacrysts 1 to 3 cm across (also plagioclase megacrysts in darker rocks), locally associated with amphibolite or hornblende schist
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Obr
Enumerated_Domain_Value_Definition:
Brimfield Schist (includes Hamilton Reservoir Formation) (Upper? and Middle Ordovician) - Gray, rusty-weathering, medium- to coarse-grained, interlayered schist and gneiss, composed of oligoclase, quartz, K-feldspar, and biotite, and commonly garnet, sillimanite, graphite, and pyrrhotite. K-feldspar partly as augen 1 to 3 cm across. Minor layers and lenses of hornblende and pyroxene-bearing gneiss, amphibolite, and calc-silicate rock
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Obr?
Enumerated_Domain_Value_Definition:
Brimfield Schist - see Obr (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Obrg
Enumerated_Domain_Value_Definition:
Gneiss (metavolcanic) member [of Brimfield Schist] (Upper? and Middle Ordovician) - Medium-gray, medium-grained, layered gneiss and schist, composed of oligoclase, quartz, and biotite; some gneiss and most schist layers contain garnet and sillimanite; some gneiss layers contain garnet, hornblende, or pyroxene or grade into amphibolite or calc-silicate rock. Probably includes metavolcanic rocks
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Obs
Enumerated_Domain_Value_Definition:
Bristol Gneiss (Middle? Ordovician) - Light, medium-grained, massive to well-layered gneiss, composed of plagioclase, quartz, and biotite, also muscovite and garnet in many layers, interlayered in places with dark amphibolite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Oc
Enumerated_Domain_Value_Definition:
Collinsville Formation (Middle Ordovician) - Mixture of rock types as described for the two members; in many areas felsic and mafic striped metavolcanic rocks predominate
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ocg
Enumerated_Domain_Value_Definition:
Hornblende gneiss member [of Collinsville Formation] (Middle Ordovician) - Dark, fine- to medium-grained, well-layered amphibolite and hornblende gneiss, composed or hornblende and plagioclase, commonly with biotite, garnet, or epidote, interlayered with light-gray felsic gneiss and pink quartz-spessartine rock (coticule). Grades into Bristol Gneiss
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Och
Enumerated_Domain_Value_Definition:
Collins Hill Formation ( = Partridge Formation of New Hampshire) (Upper? and Middle Ordovician) - Gray, rusty-weathering, medium- to coarse-grained, poorly layered schist, composed of quartz, oligoclase, muscovite, biotite, and garnet, and commonly staurolite, kyanite, or sillimanite, generally graphitic, interlayered with fine-grained two-mica gneiss, especially to the west, and with calc-silicate and amphibolite layers, also rare quartz-spessartine (colicule) layers
Enumerated_Domain_Value_Definition_Source:
State of Connecticut, Department of Environmental Protection
Enumerated_Domain:
Enumerated_Domain_Value: Ochv
Enumerated_Domain_Value_Definition:
Metavolcanic member [of Collins Hill Formation] (Upper? and Middle Ordovician) - Ranges from mafic to felsic, from dark layered amphibolite and hornblende schist, locally with garnet or epidote, to light-gray (in places purplish), laminated gneiss, composed of quartz, oligoclase, and biotite, in which some layers contain garnet (generally manganiferous) and hornblende or cummingtonite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ocm
Enumerated_Domain_Value_Definition:
Cobble Mountain Formation (Middle Ordovician) - Gray to silvery (not rusty), medium- to coarse-grained, generally layered schist and granofels, composed of quartz, oligoclase, muscovite, biotite, and garnet, and locally kyanite and staurolite or sillimanite. Some amphibolite layers
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ocs
Enumerated_Domain_Value_Definition:
Sweetheart Mountain Member [of Collinsville Formation] (Middle Ordovician) - Gray and silvery (not rusty), medium- to coarse-grained, poorly layered schist, composed of quartz, oligoclase, biotite, muscovite, and garnet, and in places kyanite or sillimanite. Amphibolite layers common; also layers of quartz-spessartine rock (coticule)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Og
Enumerated_Domain_Value_Definition:
Ordovician(?) granitic gneiss (including local terms Ansonia, Mine Hill, 'Tyler Lake', 'Siscowit') (Middle Ordovician?) - White, light-gray, buff, or pink, generally foliated granitic gneiss, composed of sodic plagioclase, quartz, microcline, muscovite, and biotite, and locally garnet or sillimanite. Commonly contains numerous inclusions or layers of mica schist and gneiss
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Og?
Enumerated_Domain_Value_Definition:
Ordovician? granitic gneiss - see Og (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ogh
Enumerated_Domain_Value_Definition:
Golden Hill Schist (may be equivalent to part of Trap Falls Formation) (Lower? Ordovician) - Gray to silvery, medium- to coarse-grained, generally layered schist and granofels, composed of quartz, muscovite, biotite, plagioclase, and garnet
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ogh?
Enumerated_Domain_Value_Definition:
Golden Hill Schist - see Ogh (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ogl
Enumerated_Domain_Value_Definition:
Glastonbury Gneiss (Middle? Ordovician) - Gray, medium- to coarse-grained, massive to well-foliated granitoid gneiss composed of oligoclase, quartz, microcline, and biotite, (as patches), also epidote and hornblende in many areas, commonly associated with layers of amphibolite; elsewhere minor muscovite and garnet
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Oh
Enumerated_Domain_Value_Definition:
Harrison Gneiss (including Prospect Gneiss) (Middle? Ordovician) - Interlayered dark- and light-gray, medium-grained, well-foliated gneiss, composed of andesine, quartz, hornblende, and biotite (also locally K-feldspar as megacrysts 1 to 5 cm long). Thought to be metavolcanic equivalent of unit Ob
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Oh?
Enumerated_Domain_Value_Definition:
Harrison Gneiss - see Oh (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ohb
Enumerated_Domain_Value_Definition:
Beardsley (hornblendic) Member [of Harrison (Prospect) Gneiss] (Middle? Ordovician) - Gray to dark-gray, medium-grained, lineated gneiss
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ohc
Enumerated_Domain_Value_Definition:
Hawley Formation (carbonaceous schist facies) (Middle Ordovician) - Gray, rusty-weathering, fine- to medium-grained, generally layered schist and granofels, composed of quartz, oligoclase, and biotite; some muscovite and graphite, rare garnet and kyanite or sillimanite. Layers of quartz-spessartine rock (coticule) common
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ohn
Enumerated_Domain_Value_Definition:
Nodular member [of Harrison Gneiss] (Middle? Ordovician) - Harrison Gneiss containing prominent quartz-sillimanite nodules
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ohp
Enumerated_Domain_Value_Definition:
Pumpkin Ground (porphyritic) Member [of Harrison (Prospect) Gneiss] (Middle? Ordovician) - Medium- to light-gray, medium- to coarse-grained, well-layered and foliated gneiss, composed of oligoclase, microcline, quartz, and biotite; some layers have numerous microcline megacrysts 1 to 5 cm across; others have hornblende. Minor layers of garnetiferous schist and gneiss
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ol
Enumerated_Domain_Value_Definition:
Litchfield Norite (Middle? Ordovician) - Dark, medium- to coarse-grained, mostly massive mafic rock (olivine norite, quartz norite, hypersthene pyroxenite), composed of labradorite, hypersthene, augite, and olivine in varying proportions, also hornblende and biotite (and minor quartz in quartz norite). Associated with small mineral deposits of pyrrhotite, pentlandite, and chalcopyrite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Om
Enumerated_Domain_Value_Definition:
Middletown Formation ( = Ammonoosuc Volcanics of New Hampshire) (Middle Ordovician) - Heterogeneously interlayered dark- to light-gray, generally medium grained gneiss and granofels, ranging from quartz-biotite gneiss through felsic amphibolite gneiss to amphibolite and characteristically containing anthophyllite or cummingtonite with or without hornblende. Also layers of calc-silicate rock and of biotite gneiss with quartz-sillimanite nodules
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Om?
Enumerated_Domain_Value_Definition:
Middletown Formation -  see Om (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Oma
Enumerated_Domain_Value_Definition:
Maltby Lakes Metavolcanics (Middle? Ordovician) - Green to gray-green, fine-grained, massive to well-foliated and layered greenstone, greenschist, and schist; also dark amphibolite to west and southwest
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Omal
Enumerated_Domain_Value_Definition:
Lower part [of Maltby Lakes Metavolcanics] (Middle? Ordovician) - Gray-green to green, fine-grained, generally well foliated greenschist, greenstone, and schist or phyllite, composed of albite and chlorite, plus quartz and sericite or epidote and actinolite, mixed metavolcanic and metasemidentary rocks
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Omau
Enumerated_Domain_Value_Definition:
Upper part [of Maltby Lakes Metavolcanic] (Middle? Ordovician) - Green to gray-green, fine-grained, layered and foliated to massive greenstone and greenschist, composed of epidote, albite, actinolite, and chlorite, and locally minor quartz, sericite, garnet, pyrite, or calcite. Mainly metavolcanic
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Oml
Enumerated_Domain_Value_Definition:
Lower member [of Middletown Formation] (Middle Ordovician) - Dark- to medium-gray amphibolite and hornblende gneiss, commonly with garnet, diopside, or epidote, interlayered with light-gray gneiss composed of oligoclase, quartz, biotite, and generally one or more amphiboles, also garnet
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Omm
Enumerated_Domain_Value_Definition:
Massive mafic rock [in Middletown Formation] (Middle Ordovician) - Dark, coarse-grained, massive amphibolite and metagabbro, composed of hornblende and plagioclase; in places with quartz and epidote, in others with patches of actinolite or anthophyllite, chlorite, and epidote or garnet. May be intrusive
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Omo
Enumerated_Domain_Value_Definition:
Monson Gneiss (may be equivalent to part of Waterford Group) (Middle or Lower Ordovician?) - Interlayered light to dark, mostly medium to coarse-grained gneiss and amphibolite; gneiss composed of plagioclase, quartz and biotite, with hornblende in some layers and microcline in others; traces of garnet, epidote, and magnetite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Omu
Enumerated_Domain_Value_Definition:
Upper member [of Middletown Formation] (Middle Ordovician) - Light-gray, generally rusty weathering, well-layered gneiss and granofels, composed of oligoclase, quartz, biotite, and amphibole (cummingtonite, anthophyllite, gedrite, or hornblende, or several of these), also garnet and chlorite. Many layers of amphibolite and biotite gneiss throughout
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Oo
Enumerated_Domain_Value_Definition:
Oronoque Schist (Lower? Ordovician) - Gray to silver, medium- to fine-grained, well-layered to laminated schist and granofels, composed of quartz, oligoclase or albite, muscovite or sericite, biotite or chlorite, and in western belt local garnet, staurolite, and kyanite. Small lenses of amphibolite or greenstone
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Op
Enumerated_Domain_Value_Definition:
Preston Gabbro (Middle Ordovician or older) - Dark, medium- to coarse-grained, mainly massive gabbro, composed of labradorite, augite, and opaques, generally with hornblende, locally hypersthene or olivine or both
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Op+Oq
Enumerated_Domain_Value_Definition:
 Preston Gabbro and Quinebaug Formation undivided -  see Op and Oq
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Opd
Enumerated_Domain_Value_Definition:
Dioritic phase [of Preston Gabbro] (Middle Ordovician or older) - Medium- to dark-gray, streaked or speckled, medium-grained diorite and quartz diorite, gneissic where sheared near contact, composed of plagioclase, hornblende, and biotite, and locally quartz and relic pyroxene
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Oq
Enumerated_Domain_Value_Definition:
Quinebaug Formation (Middle Ordovician or older) - Medium- to dark-gray, commonly greenish, medium-grained, well-layered gneiss, composed of hornblende, andesine, biotite, and epidote, commonly with quartz or garnet, interlayered with amphibolite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Oqb
Enumerated_Domain_Value_Definition:
Black Hill Member [of Quinebaug Formation] (Middle Ordovician or older) - Gray, medium- to fine-grained, well-layered schist and granofels, composed of oligoclase, quartz, and biotite, commonly with hornblende or muscovite, and locally with calcite, garnet, or epidote
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Oqf
Enumerated_Domain_Value_Definition:
Felsic gneiss member [of Quinebaug Formation] (Middle Ordovician or older) - Light- to medium-gray, fine- to medium-grained gneiss, composed of plagioclase, quartz, biotite, and muscovite, commonly with K-feldspar
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Or
Enumerated_Domain_Value_Definition:
Ratlum Mountain Schist (Lower? Ordovician) - Gray, medium-grained, interlayered schist and granofels, composed of quartz, oligoclase, muscovite (in the schist), biotite, and garnet, also staurolite and kyanite in the schist. Numerous layers and lenses of amphibolite; also some of quartz-spessartine (coticule) and calc-silicate rock
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Or+Ora
Enumerated_Domain_Value_Definition:
 Ratlum Mountain Schist and Amphibolite unit in Ratlum Mountain Schist undivided -  see Or and Ora
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Or?
Enumerated_Domain_Value_Definition:
Ratlum Mountain Schist - see Or (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ora
Enumerated_Domain_Value_Definition:
Amphibolite unit [in Ratlum Mountain Schist] (Lower? Ordovician) - Black or mottled, generally massive amphibolite and hornblende gneiss, composed of hornblende and andesine, commonly with minor quartz and magnetite, and locally with garnet, biotite, and epidote
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ose
Enumerated_Domain_Value_Definition:
Units e and d [of Strockbridge Marble] (Lower Ordovician) - White to gray massive calcite marble, commonly mottled with dolomite and locally interlayered with dolomite marble and calcareous siltstone and sandstone
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Osg
Enumerated_Domain_Value_Definition:
Units g and f [of Strockbridge Marble] (Lower Ordovician) - White to gray massive calcite marble with layers and laminae of dolomitic marble
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ot
Enumerated_Domain_Value_Definition:
Taine Mountain Formation (Lower? Ordovician) - Gray, medium-grained, generally fairly well layered to well-laminated ('pin-stripe') gneissic or schistose granofels, composed of quartz, oligoclase, biotite, muscovite, and garnet, and locally staurolite and kyanite or sillimanite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ot+Oc
Enumerated_Domain_Value_Definition:
Taine Mountain and Collinsville Formation undivided - see Ot and Oc
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ota
Enumerated_Domain_Value_Definition:
Tatnic Hill Formation (Upper? and Middle Ordovician) - Medium- to dark-gray, medium-grained gneiss or schist composed of quartz, andesine, biotite, garnet, and sillimanite, locally kyanite, muscovite, or K-feldspar, interlayered with locally mappable units and thinner layers of rusty-weathering graphitic pyrrhotitic two-mica schist, amphibolite, and calc-silicate rock
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Otaf
Enumerated_Domain_Value_Definition:
Fly Pond (calc-silicate) Member [of Tatnic Hill Formation] (Upper? and Middle Ordovician) - Light-gray, medium-grained, layered to massive calc-silicate gneiss, composed of andesine, quartz, hornblende or actinolite, epidote, and commonly diopside, biotite, and scapolite; some layers are calcitic
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Otay
Enumerated_Domain_Value_Definition:
Yantic Member [of Tatnic Hill Formation] (Upper? and Middle Ordovician) - Medium- to dark-gray, fine- to medium-grained schist, composed of quartz, oligoclase, biotite, and muscovite, some layers with garnet, staurolite, and kyanite or garnet and sillimanite, local epidote or K-feldspar; some layers of rusty-weathering graphitic, pyrrhotitic, two-mica schist
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Otb
Enumerated_Domain_Value_Definition:
Basal member [of Taine Mountain Formation] around Waterbury dome (Lower? Ordovician) - Differs from rest of Taine Mountain Formation in being especially well layered and generally less micaceous and schistose
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Otf
Enumerated_Domain_Value_Definition:
Trap Falls Formation (may be equivalent in part to Golden Hill Schist) (Middle or Lower Ordovician) - Gray to silvery, partly rusty weathering, medium-grained, generally well layered schist, composed of quartz, sodic plagioclase, biotite, muscovite, and garnet, locally with sillimanite or kyanite, interlayered with two-mica gneiss and granulite and with amphibolite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Otf+Og
Enumerated_Domain_Value_Definition:
 Trap Falls Formation and Ordovician? granitic gneiss undivided -  see Otf and Og
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Otfc
Enumerated_Domain_Value_Definition:
Carringtons Pond Member [of Trap Falls Formation] (Middle or Lower Ordovician) - Interlayered medium- to dark-gray, rusty-weathering, medium-grained schist and light-gray, fine- to medium-grained gneiss, composed of quartz, sodic plagioclase, biotite, muscovite, and garnet; schist locally contains sillimanite or kyanite; gneiss locally contains K-feldspar; amphibolite layers common
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Otfg
Enumerated_Domain_Value_Definition:
Schist and granulite member [of Trap Falls Formation] (Middle or Lower Ordovician) - Interlayered gray to silvery, medium- to coarse-grained schist and fine-grained granofels, composed of quartz, sodic plagioclase, biotite, and muscovite; garnet common in schist
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Otfs
Enumerated_Domain_Value_Definition:
Shelton (white gneiss) Member [of Trap Falls Formation] (Middle or Lower Ordovician) - White, light-gray, or buff, fine- to medium-grained, generally well foliated granitic gneiss, composed of sodic plagioclase, quartz, microcline, muscovite, and garnet (in tiny almost ubiquitous grains), also commonly minor biotite; generally interlayered with mica schist, biotite gneiss, and calc-silicate rock. Thought to be metavolcanic equivalent of unit Og
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ots
Enumerated_Domain_Value_Definition:
Scranton Mountain Member [of Taine Mountain Formation] (Lower? Ordovician) - Gray, rusty-weathering, medium-grained schist, composed of quartz, muscovite, biotite, plagioclase, garnet, and generally kyanite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Otw
Enumerated_Domain_Value_Definition:
Wildcat Member [of Taine Mountain Formation] (Lower? Ordovician) - Gray, medium-grained, generally fairly well layered to well-laminated ('pin-stripe') gneissic or schistose granofels, composed of quartz, oligoclase, biotite, muscovite, and garnet, and locally starolite and kyanite or sillimanite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Otwv
Enumerated_Domain_Value_Definition:
Whigville Member [of Taine Mountain Formation] (Lower? Ordovician) - Gray, medium-grained, generally fairly well layered to well-laminated ('pin-stripe') gneissic or schistose granofels, composed of quartz, oligoclase, biotite, muscovite, and garnet, and locally staurolite and kyanite or sillimanite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ow
Enumerated_Domain_Value_Definition:
Walloomsac Schist (Middle Ordovician) - Black to dark-or silvery-gray, rarely layered schist or phyllite, composed of quartz, albite, and commonly garnet and staurolite or sillimanite (locally strongly retrograded to chlorite and muscovite). Locally feldspathic or calcareous near the base
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Owm
Enumerated_Domain_Value_Definition:
Basal marble member [of Walloomsac Schist] (Middle Ordovician) - Dark-gray to white, massive to layered schistose or phyllitic calcite-phlogopite marble
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Pn
Enumerated_Domain_Value_Definition:
Narragansett Pier Granite (Permian) - Pink to red, medium- to coarse-grained (commonly pegmatitic), generally massive (not gneissic) granite, composed of microcline, oligoclase, quartz, and biotite and accessory muscovite and magnetite. Considerable associated pegmatite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Pnm
Enumerated_Domain_Value_Definition:
Mafic phase [of Narragansett Pier Granite] (Permian) - Gray to reddish, medium-grained, generally massive granite, like Pn but with more biotite and locally hornblende
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Pp
Enumerated_Domain_Value_Definition:
Porphyry (dacite or rhyolite) (Permian) - Light-colored, very fine grained, massive porphyry with phenocrysts of quartz, feldspar, and biotite; muscovite and accessory fluorite in ground mass
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ppa
Enumerated_Domain_Value_Definition:
Pinewood Adamellite (Permian) - Light-gray, medium-grained, massive adamellite, composed of microcline, albite, quartz, and muscovite with accessory fluorite. High radioactivity
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ps
Enumerated_Domain_Value_Definition:
Syenite (Permian) - Medium-gray, massive syenite, composed of microcline, amphibole (arfvedsonite), and biotite with accessory apatite and sphene
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Pw
Enumerated_Domain_Value_Definition:
Westerly Granite (Permian) - Light-gray, pink-weathering, fine-grained, massive, aplitic granite, composed of oligoclase or albite, quartz, and K-feldspar, with minor biotite and accessory muscovite, magnetite, allanite, and sphene
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Pzmy
Enumerated_Domain_Value_Definition:
Mylonite along Paleozoic faults (Upper or Middle Paleozoic) - Mylonite, blastomylonite, and blastomylonitic gneiss, composed of intensely granulated quartz, plagioclase, biotite, and epidote, in places with hornblende or microcline and commonly with secondary minerals. In places has later been silicified (compare unit Jsi)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: SObl
Enumerated_Domain_Value_Definition:
Lower member [of Bigelow Brook Formation] (Silurian or Ordovician or both) - Chiefly gray, medium-grained, well-layered granofels, composed of quartz, oligoclase, and biotite, commonly with garnet and sillimanite, interlayered with thinly fissile sillimanitic, graphitic, pyrrhotitic biotite schist and with calc-silicate rock
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: SObm
Enumerated_Domain_Value_Definition:
Middle member [of Bigelow Brook Formation] (Silurian and perhaps Ordovician) - Greenish-gray, medium-grained calc-silicate rock, composed of plagioclase, quartz, and diopside (locally hornblende and scapolite), interbedded with schist and granofels composed of plagioclase, quartz, biotite, and commonly garnet and sillimanite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: SObu
Enumerated_Domain_Value_Definition:
Upper member [of Bigelow Brook Formation] (Silurian and perhaps Ordovician) - Chiefly gray, rusty-weathering, medium-grained, generally well layered and locally fissile schist, composed of plagioclase, quartz, biotite, garnet, and sillimanite, locally with K-feldspar or cordierite, fissile layers commonly with graphite and pyrrhotite, interlayered with quartzose granofels with less biotite but with calc-silicate minerals
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: SOh
Enumerated_Domain_Value_Definition:
Hebron Gneiss (Silurian and Ordovician) - Interlayered dark-gray, medium- to coarse-grained schist, composed of andesine, quartz, biotite, and local K-feldspar, and greenish-gray, fine- to medium-grained calc-silicate rock, composed of labradorite, quartz, biotite, actinolite, hornblende, and diopside, and locally scapolite. Local lenses of graphitic two-mica schist
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: SOs
Enumerated_Domain_Value_Definition:
Southbridge Formation (Silurian or Ordovician or both) - Dark- to light-gray, locally rusty, fine- to medium-grained interlayered granofels and schist, composed of quartz, plagioclase, and biotite, with muscovite in schist and amphibole, calc-silicate minerals, or K-feldspar in certain layers; also locally mappable units and thinner layers of calc-silicate rock, amphibolite, and sillimanite-garnet and sillimanite-graphite-pyrrhotite schist
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: SOs?
Enumerated_Domain_Value_Definition:
Southbridge Formation -  see SOs (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: SOsp
Enumerated_Domain_Value_Definition:
Porphyritic member [of Southbridge Formation] (Silurian or Ordovician or both) - Light-to medium-gray, fine-grained porphyritic massive to layered gneiss, composed of quartz, oligoclase, microcline, and biotite, with megacrysts 1 to 2 cm long of microcline
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Sbc
Enumerated_Domain_Value_Definition:
Clough Quartzite (Silurian) - White, medium-grained, glassy to granular, well-layered quartzite and muscovitic quartzite, locally with garnet; conglomeratic (commonly with tourmaline) in lower part
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Sbf
Enumerated_Domain_Value_Definition:
Fitch Formation (Silurian) - Gray, fine- to medium-grained calc-silicate rock, composed of quartz, biotite, calcite, actinolite, diopside, microcline, and locally garnet, scapolite, or epidote, interlayered with two-mica schist
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Stb
Enumerated_Domain_Value_Definition:
Basal member [of The Straits Schist] ( = Russell Mountain Formation of Massachusetts) (Silurian) - Distinguished by presence of layers of amphibolite, marble, calc-silicate rock, and quartzite within more uniform schist like that on either side. Minor, unevenly distributed mineralization in W, Bi, Cu, Ni, and other metals
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: TRnh
Enumerated_Domain_Value_Definition:
New Haven Arkose (Upper Triassic; possibly Lower Jurassic at top) - Red, pink, and gray coarse-grained, locally conglomeratic, poorly sorted and indurated arkose, interbedded with brick-red micaceous, locally shaly siltstone and fine-grained feldspathic clayey sandstone
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: TRnh+Jb
Enumerated_Domain_Value_Definition:
 New Haven Arkose and Buttress Dolerite undivided -  see TRnh and Jb
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Yg
Enumerated_Domain_Value_Definition:
Gneiss of Highlands massifs, (including Fordham Gneiss) (Proterozoic Y; may contain some older rocks) - Mixture of rock types described below, where not separately mapped
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Yga
Enumerated_Domain_Value_Definition:
Augen gneiss (including local term 'Danbury Gneiss', equivalent in part to Tyringham Gneiss of Massachusetts) (Proterozoic Y) - Medium-gray to spotted, fine- to medium-grained, porphyritic, foliated and lineated granitic gneiss, composed of microcline (largely as megacrysts or augen up to 10 cm long), quartz, albite, or oligoclase, biotite and minor hornblende
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ygh
Enumerated_Domain_Value_Definition:
Hornblende gneiss and amphibolite (Proterozoic Y) - Dark-gray to mottled, fine- to medium-grained, massive to foliated amphibolite and gneiss, composed of hornblende and plagioclase, also commonly biotite and minor quartz; commonly interlayered with banded felsic gneiss. Locally contains calc-silicate rock or diopsidic calcite marble
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ygn
Enumerated_Domain_Value_Definition:
Layered gneiss (Proterozoic Y) - Gray, medium-grained, well-foliated and generally well layered, light and dark, but locally wispy gneiss, composed of quartz and plagioclase, with microcline locally in the light layers and abundant biotite and common hornblende in the dark layers; garnet or epidote locally. Layers and lenses of calc-silicate rock and amphibolite in some areas
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ygr
Enumerated_Domain_Value_Definition:
Pink granitic gneiss (Proterozoic Y) - Light-pink to gray, medium- to coarse-grained, foliated but generally massive or poorly layered granitic gneiss, composed of quartz, microcline, oligoclase, and either biotite or muscovite or both, also locally amphibole or epidote
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ygs
Enumerated_Domain_Value_Definition:
Rusty mica schist and gneiss (equivalent in part to Washington Gneiss of Massachusetts) (Proterozoic Y; may contain some older rocks) - Dark-gray, rusty-weathering, well-foliated and well- to poorly layered schist and gneiss composed of quartz, plagioclase, biotite, muscovite, sillimanite, and locally garnet; some layers of feldspathic quartzite and garnetiferous amphibolite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zl
Enumerated_Domain_Value_Definition:
Light House Gneiss (Proterozoic Z?) - Light-pink or gray to red, medium-grained, generally well foliated granitic gneiss, composed of K-feldspar, oligoclase, quartz, biotite, and magnetite, with local muscovite but no garnet
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zp
Enumerated_Domain_Value_Definition:
Plainfield Formation (Proterozoic Z?) - Interlayered light-gray, thin-bedded quartzite, in places with feldspar, mica, graphite, or pyrite, light- to medium-gray gneiss composed of quartz, oligoclase, and biotite (rarely microcline), medium- to dark-gray schist composed of quartz, oligoclase, biotite, sillimanite, and garnet, dark-gray or green gneiss composed of plagioclase, quartz, biotite, and hornblende (commonly with diopside), amphibolite, diopside-bearing quartzite, and calc-silicate rock. In places contains quartz-sillimanite nodules
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zp+Zsc+Pn
Enumerated_Domain_Value_Definition:
 Plainfield Formation, Stony Creek Granite Gneiss and Narragansett Pier Granite undivided -  see Zp, Zsc and Pn
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zp+Zsph+Pn?
Enumerated_Domain_Value_Definition:
Plainfield Formation, Potter Hill Granite Gneiss and Narragansett Pier Granite undivided -  see Zp, Zsph and Pn (? denotes uncertain identification of the formation, with the most closely associated formation symbol used for the map unit).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zpq
Enumerated_Domain_Value_Definition:
Quartzite unit [in Plainfield Formation] (Proterozoic Z?) - Light-gray, glassy, generally thin bedded quartzite, also feldspathic and micaceous quartzite containing quartz-sillimanite nodules
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zpq+Zsc+Pn
Enumerated_Domain_Value_Definition:
 Quartzite unit in Plainfield Formation, Stony Creek Granite Gneiss and Narragansett Pier Granite undivided -  see Zpq, Zsc and Pn
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zsc+Pn
Enumerated_Domain_Value_Definition:
 Stony Creek Granite Gneiss and Narragansett Pier Granite undivided -  see Zsc and Pn
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zsh
Enumerated_Domain_Value_Definition:
Hope Valley Alaskite Gneiss (Proterozoic Z?) - Light-pink to gray, medium- to coarse-grained, locally porphyritic, variably lineated and foliated alaskitic gneiss, composed of microcline, quartz, albite or oligoclase, and minor magnetite, and locally biotite and muscovite. Lineation formed by rods of quartz. Locally contains quartz-sillimanite nodules
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zsp
Enumerated_Domain_Value_Definition:
Ponaganset Gneiss (Proterozoic Z?) - Dark-gray, coarse-grained, porphyritic, well-foliated gneiss, composed of oligoclase, quartz, microcline (mostly as megacrysts up to 8 cm long), biotite, magnetite, and generally hornblende; also garnet and muscovite where hornblende is absent
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zsph
Enumerated_Domain_Value_Definition:
Potter Hill Granite Gneiss (Proterozoic Z?) - Light-pink to gray, tan-weathering, fine- to medium-grained, rarely porphyritic, well-foliated (not lineated) granitic gneiss, composed of microcline, quartz, oligoclase (or albite), biotite, and magnetite, minor muscovite, and local garnet
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zsph+Pn
Enumerated_Domain_Value_Definition:
 Potter Hill Granite Gneiss and Narragansett Pier Granite undivided -  see Zsph and Pn
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zspp
Enumerated_Domain_Value_Definition:
Porphyritic phase [of Potter Hill Granite Gneiss] (Proterozoic Z?) - Light- to medium-gray, fine- to medium-grained, porphyritic, well-foliated (note lineated) granitic gneiss, composed of microcline (much of it as megacrysts up to 4 cm long), quartz, oligoclase, biotite, and magnetite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zss
Enumerated_Domain_Value_Definition:
'Scituate' Granite Gneiss (Proterozoic Z?) (probably not equivalent to type Scituate in Rhode Island, which is probably Devonian) - Light-pink to gray, medium- to coarse-grained, generally porphyritic, well-lineated and locally foliated granitic gneiss, composed of microcline, quartz, albite or orthoclase, biotite, hornblende, and magnetite. Megacrysts of microcline up to 3 cm long; lineation formed by splotches of biotite or by rods of quartz
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zw
Enumerated_Domain_Value_Definition:
Waterford Group (may be equivalent in part to Monson Gneiss) (Proterozoic Z?) - Interlayered part (but layers locally distinct) of Waterford Group, light to dark, generally medium grained gneiss, composed of plagioclase, quartz, and biotite, with hornblende in some layers and microcline in others. Some layers of amphibolite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zw+Zb
Enumerated_Domain_Value_Definition:
 Waterford Group and Branford Gneiss undivided -  see Zw and Zb
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zw+Zsc+Pn
Enumerated_Domain_Value_Definition:
 Waterford Group, Stony Creek Granite Gneiss and Narragansett Pier Granite undivided -  see Zw, Zsc and Pn
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zwm
Enumerated_Domain_Value_Definition:
Mamacoke Formation (Proterozoic Z?) - Interlayered (but layers locally indistinct) light- to dark-gray, medium-grained gneiss, composed of plagioclase, quartz, and biotite; sillimanite, garnet, hornblende, or microcline in certain layers; in upper part locally contains quartz-sillimanite nodules or thin layers of quartzite, amphibolite, or calc-silicate rock
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zwn
Enumerated_Domain_Value_Definition:
New London Gneiss (Proterozoic Z?) - Massive, gray granodioritic gneiss, also interlayered light-gray gneiss and dark-gray amphibolite; gneiss generally medium grained; composed of oligoclase, quartz, biotite, and magnetite, also microcline in massive gneiss
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zwnj
Enumerated_Domain_Value_Definition:
Joshua Rock Member [of New London Gneiss] (Proterozoic Z?) (may include intrusive rocks of Ordovician age) - Medium-gray (weathers with red spots of hematite), medium-grained, foliated gneiss composed of microperthite, quartz, albite, aegerine-augite, and magnetite; rare riebeckite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Zwr
Enumerated_Domain_Value_Definition:
Rope Ferry Gneiss (Proterozoic Z?) - Interlayered (but layers commonly lenticular to indistinct) light- to dark-gray, fine- to medium-grained gneiss, composed of plagioclase, quartz, and biotite, with hornblende in some layers and microcline in others; local layers of amphibolite
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: l
Enumerated_Domain_Value_Definition:
Unmapped - Unmapped
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: u
Enumerated_Domain_Value_Definition:
Ultramafic rock (Ordovician or older) - Ultramafic rock, originally composed of olivine an pyroxene, now generally altered to tremolite, talc, chlorite, or serpentine
Enumerated_Domain_Value_Definition_Source:
compiler
Attribute:
Attribute_Label: FORMATION
Attribute_Definition:
Geologic Formation Name - The name of the geologic formation associated with the geologic unit.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Unrepresentable_Domain:
text value
Attribute:
Attribute_Label: DEFINITION
Attribute_Definition:
Geologic Description - A brief description of the geologic unit.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Unrepresentable_Domain:
text value
Attribute:
Attribute_Label: TERR_COD
Attribute_Definition:
Terrane Code - A geologic terrane code (alphanumeric) that denotes the map unit's associated geologic terrane.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition:
Fault Related Rocks
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition:
Newark Terrane / Hartford and Pomperaug Mesozoic Basins
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 2a
Enumerated_Domain_Value_Definition:
Proto-North American (Continental) Terrane / Ordovician and Cambrian Shelf Sequence
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 2b
Enumerated_Domain_Value_Definition:
Proto-North American (Continental) Terrane / Proterozoic Massifs - "Grenville"
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 3a
Enumerated_Domain_Value_Definition:
Iapetos (Oceanic) Terrane / Connecticut Valley Synclinorium
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 3a/3b
Enumerated_Domain_Value_Definition:
Iapetos (Oceanic) Terrane / Connecticut Valley Synclinorium and Bronson Hill Anticlinorium
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 3a/om
Enumerated_Domain_Value_Definition:
Iapetos (Oceanic) Terrane / Connecticut Valley Synclinorium / Orange Milford Belt
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 3b
Enumerated_Domain_Value_Definition:
Iapetos (Oceanic) Terrane / Bronson Hill Anticlinorium
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 3c
Enumerated_Domain_Value_Definition:
Iapetos (Oceanic) Terrane / Merrimack Synclinorium
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 3d
Enumerated_Domain_Value_Definition:
Proto-North American (Continental) Terrane / Taconic Allochthons (Displaced Iapetos Terrane)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition:
Avalonian (Continental) Terrane / Avalonian Anticlinorium
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 99
Enumerated_Domain_Value_Definition:
Unmapped
Enumerated_Domain_Value_Definition_Source:
compiler
Attribute:
Attribute_Label: TERRANE
Attribute_Definition:
Geologic Terrane - provides the explanation of the geologic terrane code. TERRANE is the English Equivalent of (decodes) the TERR_COD field.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Unrepresentable_Domain:
See Enumerated Domain Value Definitions for TERR_COD attribute.
Attribute:
Attribute_Label: LITHO1
Attribute_Definition:
First Lithology - The primary lithology of the geologic unit. These lithologic values were determined from the short description of map units, with minor adjustments made from field observations. Simplified descriptions are given for rock terms used above. Descriptions include general and distinguishing characteristics of rocks as they commonly occur in Connecticut.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Amphibolite
Enumerated_Domain_Value_Definition:
Dark-colored, fine-to coarse-grained, massive to poorly layered metamorphic rock containing amphibole and plagioclase with little or no quartz.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Arkose
Enumerated_Domain_Value_Definition:
Red to brown, medium-to coarse-grained, sandstone-like, sedimentary rock containing quartz, feldspar, and rock fragments. It is the most common sedimentary rock of the Central Lowlands; locally known as brownstone. Brownstone was quarried for use as building stone.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Basalt
Enumerated_Domain_Value_Definition:
Dark-gray, orange-to brown-weathering, fine-grained, extrusive igneous rock, commonly fractured (jointed), containing calcium-plagioclase and pyroxene; occurs as lava flows in the Central Lowlands; locally known as traprock. Basalt is extensively quarried for use as crushed stone.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Diorite
Enumerated_Domain_Value_Definition:
Light and dark (salt and pepper), medium- to coarse-grained intrusive igneous rock, commonly massive-appearing, generally lacking layering or banding; composed primarily of plagioclase feldspar, quartz and dark minerals.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Diorite Gneiss
Enumerated_Domain_Value_Definition:
Light and dark, medium- to coarse-grained, compositionally banded metamorphic rock of dioritic composition.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dolerite
Enumerated_Domain_Value_Definition:
Dark-gray, orange- to brown- to gray-weathering, medium- to fine-grained intrusive igneous rock, commonly fractured into well-developed columnar joints, compositionally similar to basalt; occurs as dikes and sills in both the lowlands and uplands; locally known as traprock. Dolerite is quarried for use as crushed stone.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Gabbro
Enumerated_Domain_Value_Definition:
Dark, medium- to coarse-grained, intrusive mafic igneous rock, commonly massive-appearing, generally lacking layering or banding; composed primarily of clinopyroxene and plagioclase; often altered.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Gneiss
Enumerated_Domain_Value_Definition:
Light and dark, medium- to coarse-grained metamorphic rock characterized by compositional banding of light and dark minerals, typically composed of quartz, feldspar, and various amounts of dark minerals; occurs with a variety of compositions and is a characteristic rock of the uplands.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Granite
Enumerated_Domain_Value_Definition:
Light-colored, medium- to very coarse-grained intrusive igneous rock, commonly massive-appearing, lacking layering or banding; composed of quartz, feldspar, and commonly muscovite mica with minor amounts of dark minerals. Granite and granitic gneiss were quarried for use as dimension stone. Very limited quarrying continues.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Granite Gneiss
Enumerated_Domain_Value_Definition:
Light-colored, medium- to coarse-grained, compositionally banded metamorphic rock of granitic composition. Quarried for use as dimension stone (see granite).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Granofels
Enumerated_Domain_Value_Definition:
Light to dark, medium- to coarse-grained, massive to poorly layered metamorphic rock composed primarily of quartz and feldspar; lacking the compositional banding of a gneiss.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Greenschist
Enumerated_Domain_Value_Definition:
Light to dark, green, medium- to coarse-grained schist; typically consisting of the green minerals: chlorite, epidote, or actinolite.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Greenstone
Enumerated_Domain_Value_Definition:
Green to gray-green, fine- to coarse-grained, massive to poorly layered metamorphic rock composed of chlorite, hornblende, and epidote.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Lamprophyre
Enumerated_Domain_Value_Definition:
Dark-colored, medium-grained intrusive igneous rock occurring as dikes; composed of biotite, hornblende, pyroxene, and feldspars or feldspathoids.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Marble
Enumerated_Domain_Value_Definition:
Conspicuously white, or gray, medium- to coarse-grained, massive to layered metamorphic rock composed of calcite and/or dolomite. It is a metamorphosed limestone and underlies several major valleys in the Western Uplands. Marble is quarried for use as agricultural lime and for industrial uses.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Mylonite
Enumerated_Domain_Value_Definition:
Compact rock with streaky or banded structure, found in fault zones, and produced by extreme crushing and shearing of rocks during movement of a fault. It is particularly well developed along the Lake Char - Honey Hill fault zones of the Eastern Uplands.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Norite
Enumerated_Domain_Value_Definition:
Dark-colored, medium- to coarse-grained intrusive mafic igneous rock commonly massive-appearing, lacking layering or banding, composed of plagioclase and orthopyroxene; often altered.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Porphyry
Enumerated_Domain_Value_Definition:
Light-colored, fine-grained intrusive igneous rock with some conspicuously large crystals of quartz, feldspar, or biotite.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Quartz
Enumerated_Domain_Value_Definition:
Light-colored to gray, massive to layered, medium-grained metamorphic rock. Very hard and resistant; a metamorphosed sandstone composed primarily of quartz.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Quartzite
Enumerated_Domain_Value_Definition:
Light-colored to gray, massive to layered, medium-grained metamorphic rock. Very hard and resistant; a metamorphosed sandstone composed primarily of quartz.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Schist
Enumerated_Domain_Value_Definition:
Light, silvery to dark, coarse- to very coarse-grained, strongly to very strongly layered metamorphic rock whose layering is typically defined by parallel alignment of micas. Primarily composed of mica, quartz, and feldspar; occasionally spotted with conspicuous garnets.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Schistose Marble
Enumerated_Domain_Value_Definition:
Light-colored, fine- to coarse-grained, marble interlayered with schist or phyllite.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Shale
Enumerated_Domain_Value_Definition:
Red to brown, locally gray to green, extremely fine-grained, strongly layered sedimentary rock composed of clay minerals; occurs in the Central Lowlands.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Syenite
Enumerated_Domain_Value_Definition:
Medium-gray, fine- to coarse-grained intrusive igneous rock, commonly massive-appearing, generally lacking layering or banding, composed primarily of potassium feldspar with minor dark minerals but little quartz.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ultramafic Rock
Enumerated_Domain_Value_Definition:
Dark-colored, medium- to coarse-grained intrusive igneous rock, commonly massive-appearing, generally lacking layering or banding and originally composed chiefly of olivine and pyroxene; commonly altered to serpentine and talc. Occurs as small intrusions in the uplands.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Unmapped
Enumerated_Domain_Value_Definition:
Unmapped
Enumerated_Domain_Value_Definition_Source:
compiler
Attribute:
Attribute_Label: LITHO2
Attribute_Definition:
Second Lithology - The second lithology of the geologic unit. These lithologic values were determined from the short description of map units, with minor adjustments made from field observations. Simplified descriptions are given for rock terms used above. Descriptions include general and distinguishing characteristics of rocks as they commonly occur in Connecticut.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Amphibolite
Enumerated_Domain_Value_Definition:
Dark-colored, fine-to coarse-grained, massive to poorly layered metamorphic rock containing amphibole and plagioclase with little or no quartz.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Dolerite
Enumerated_Domain_Value_Definition:
Dark-gray, orange- to brown- to gray-weathering, medium- to fine-grained intrusive igneous rock, commonly fractured into well-developed columnar joints, compositionally similar to basalt; occurs as dikes and sills in both the lowlands and uplands; locally known as traprock. Dolerite is quarried for use as crushed stone.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Gneiss
Enumerated_Domain_Value_Definition:
Light and dark, medium- to coarse-grained metamorphic rock characterized by compositional banding of light and dark minerals, typically composed of quartz, feldspar, and various amounts of dark minerals; occurs with a variety of compositions and is a characteristic rock of the uplands.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Granitic Gneiss
Enumerated_Domain_Value_Definition:
Light-colored, medium- to coarse-grained, compositionally banded metamorphic rock of granitic composition. Quarried for use as dimension stone (see granite).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Granofels
Enumerated_Domain_Value_Definition:
Light to dark, medium- to coarse-grained, massive to poorly layered metamorphic rock composed primarily of quartz and feldspar; lacking the compositional banding of a gneiss.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Mafic Rock
Enumerated_Domain_Value_Definition:
Dark-colored rock consisting of one or more dark (iron and magnesian) minerals as its major constituent.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Pegmatite
Enumerated_Domain_Value_Definition:
Light-colored, very coarse-grained intrusive igneous rock, composed of feldspar, quartz, and micas; frequently can be seen in highway roadcuts as light-colored parallel and cross cutting veins and lenses in the metamorphic rock of the uplands; occasionally is a host for gem minerals. Pegmatite is a common and economically important rock type in Connecticut. It occurs in bodies too small to show on a state-scale geologic map. The Branchville area of western Connecticut and the Middletown area of eastern Connecticut have pegmatites of particular significance.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Phylite
Enumerated_Domain_Value_Definition:
Silvery, gray to dark-gray, fine- to very fine-grained, schist-like metamorphic rock.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Quartzite
Enumerated_Domain_Value_Definition:
Light-colored to gray, massive to layered, medium-grained metamorphic rock. Very hard and resistant; a metamorphosed sandstone composed primarily of quartz.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Schist
Enumerated_Domain_Value_Definition:
Light, silvery to dark, coarse- to very coarse-grained, strongly to very strongly layered metamorphic rock whose layering is typically defined by parallel alignment of micas. Primarily composed of mica, quartz, and feldspar; occasionally spotted with conspicuous garnets.
Enumerated_Domain_Value_Definition_Source:
compiler
Attribute:
Attribute_Label: LITHO3
Attribute_Definition:
Third Lithology - The third lithology of the geologic unit. These lithologic values were determined from the short description of map units, with minor adjustments made from field observations. Simplified descriptions are given for rock terms used above. Descriptions include general and distinguishing characteristics of rocks as they commonly occur in Connecticut.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Amphibolite
Enumerated_Domain_Value_Definition:
Dark-colored, fine-to coarse-grained, massive to poorly layered metamorphic rock containing amphibole and plagioclase with little or no quartz.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Gneiss
Enumerated_Domain_Value_Definition:
Light and dark, medium- to coarse-grained metamorphic rock characterized by compositional banding of light and dark minerals, typically composed of quartz, feldspar, and various amounts of dark minerals; occurs with a variety of compositions and is a characteristic rock of the uplands.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Marble
Enumerated_Domain_Value_Definition:
Conspicuously white, or gray, medium- to coarse-grained, massive to layered metamorphic rock composed of calcite and/or dolomite. It is a metamorphosed limestone and underlies several major valleys in the Western Uplands. Marble is quarried for use as agricultural lime and for industrial uses.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Phylite
Enumerated_Domain_Value_Definition:
Silvery, gray to dark-gray, fine- to very fine-grained, schist-like metamorphic rock.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Schist
Enumerated_Domain_Value_Definition:
Light, silvery to dark, coarse- to very coarse-grained, strongly to very strongly layered metamorphic rock whose layering is typically defined by parallel alignment of micas. Primarily composed of mica, quartz, and feldspar; occasionally spotted with conspicuous garnets.
Enumerated_Domain_Value_Definition_Source:
compiler
Attribute:
Attribute_Label: LITHO4
Attribute_Definition:
Fourth Lithology - The fourth lithology of the geologic unit. These lithologic values were determined from the short description of map units, with minor adjustments made from field observations. Simplified descriptions are given for rock terms used above. Descriptions include general and distinguishing characteristics of rocks as they commonly occur in Connecticut.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Gneiss
Enumerated_Domain_Value_Definition:
Light and dark, medium- to coarse-grained metamorphic rock characterized by compositional banding of light and dark minerals, typically composed of quartz, feldspar, and various amounts of dark minerals; occurs with a variety of compositions and is a characteristic rock of the uplands.
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Granitic Gneiss
Enumerated_Domain_Value_Definition:
Light-colored, medium- to coarse-grained, compositionally banded metamorphic rock of granitic composition. Quarried for use as dimension stone (see granite).
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Quartzite
Enumerated_Domain_Value_Definition:
Light-colored to gray, massive to layered, medium-grained metamorphic rock. Very hard and resistant; a metamorphosed sandstone composed primarily of quartz.
Enumerated_Domain_Value_Definition_Source:
compiler
Attribute:
Attribute_Label: LITHO5
Attribute_Definition:
Fifth Lithology - The fifth lithology of the geologic unit. These lithologic values were determined from the short description of map units, with minor adjustments made from field observations. Simplified descriptions are given for rock terms used above. Descriptions include general and distinguishing characteristics of rocks as they commonly occur in Connecticut.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Granite
Enumerated_Domain_Value_Definition:
Light-colored, medium- to very coarse-grained intrusive igneous rock, commonly massive-appearing, lacking layering or banding; composed of quartz, feldspar, and commonly muscovite mica with minor amounts of dark minerals. Granite and granitic gneiss were quarried for use as dimension stone. Very limited quarrying continues.
Enumerated_Domain_Value_Definition_Source:
compiler
Attribute:
Attribute_Label: AGE
Attribute_Definition:
Age - Denotes the geologic age of the mapping unit.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Cambrian
Enumerated_Domain_Value_Definition:
500 - 570 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Cambrian / Proterozoic Z
Enumerated_Domain_Value_Definition:
500-570/570-800 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Devonian
Enumerated_Domain_Value_Definition:
360 - 410 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Devonian / Permian
Enumerated_Domain_Value_Definition:
360-410/240-290 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Devonian / Silurian
Enumerated_Domain_Value_Definition:
360-410/410-435 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Jurassic
Enumerated_Domain_Value_Definition:
140 - 205 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ordovician
Enumerated_Domain_Value_Definition:
435 - 500 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Ordovician / Cambrian
Enumerated_Domain_Value_Definition:
435-500/500-570 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Permian
Enumerated_Domain_Value_Definition:
240 - 290 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Proterozoic Y
Enumerated_Domain_Value_Definition:
800 - 1700 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Proterozoic Z
Enumerated_Domain_Value_Definition:
570 - 800 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Silurian
Enumerated_Domain_Value_Definition:
410 - 435 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Silurian / Ordovician
Enumerated_Domain_Value_Definition:
410-435/435-500 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: Triassic
Enumerated_Domain_Value_Definition:
205 - 240 million years ago
Enumerated_Domain_Value_Definition_Source:
compiler
Attribute:
Attribute_Label: AGETIME
Attribute_Definition:
Geologic Time - Explains the range of dates for the geologic time period associated with the geologic age.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 140 - 205 mya
Enumerated_Domain_Value_Definition:
Jurassic (140 - 205 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 205 - 240 mya
Enumerated_Domain_Value_Definition:
Triassic (205 - 240 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 240 - 290 mya
Enumerated_Domain_Value_Definition:
Permian (240 - 290 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 360-410/240-290 mya
Enumerated_Domain_Value_Definition:
Devonian / Permian (360-410/240-290 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 360 - 410 mya
Enumerated_Domain_Value_Definition:
Devonian (360 - 410 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 360-410/410-435 mya
Enumerated_Domain_Value_Definition:
Devonian / Silurian (360-410/410-435 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 410 - 435 mya
Enumerated_Domain_Value_Definition:
Silurian (410 - 435 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 410-435/435-500 mya
Enumerated_Domain_Value_Definition:
Silurian / Ordovician (410-435/435-500 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 435 - 500 mya
Enumerated_Domain_Value_Definition:
Ordovician (435 - 500 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 435-500/500-570 mya
Enumerated_Domain_Value_Definition:
Ordovician / Cambrian (435-500/500-570 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 500 - 570 mya
Enumerated_Domain_Value_Definition:
Cambrian (500 - 570 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 500-570/570-800 mya
Enumerated_Domain_Value_Definition:
Cambrian / Proterozoic Z (500-570/570-800 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 570 - 800 mya
Enumerated_Domain_Value_Definition:
Proterozoic Z (70 - 800 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Enumerated_Domain:
Enumerated_Domain_Value: 800 - 1700 mya
Enumerated_Domain_Value_Definition:
Proterozoic Y (800 - 1700 million years ago)
Enumerated_Domain_Value_Definition_Source:
compiler
Attribute:
Attribute_Label: ACREAGE
Attribute_Definition:
Calculated area of polygon feature in acres. Note, ACREAGE values are not automatically updated after modifying feature geometry (shape). Values must be recalculated after features are edited, simplified, generalized, clipped, dissolved, etc.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Unrepresentable_Domain:
Numeric field
Attribute:
Attribute_Label: AREA_SQMI
Attribute_Definition:
Calculated area of polygon feature in square miles. Note, AREA_SQMI values are not automatically updated after modifying feature geometry (shape). Values must be recalculated after features are edited, simplified, generalized, clipped, dissolved, etc.
Attribute_Definition_Source:
State of Connecticut, Department of Environmental Protection
Attribute_Domain_Values:
Unrepresentable_Domain:
Numeric field
Attribute:
Attribute_Label: SHAPE.area
Attribute:
Attribute_Label: SHAPE.len
Overview_Description:
Entity_and_Attribute_Overview:
Bedrock Geology polygon features describe 157 geologic units for arkose, basalt, gneiss, granite, marble, shist, shale and other rock types. The information encoded about the geologic unites includes the formation name, description, geologic terrane, and age. Use the UNIT attribute as the key field that identifies and differentiates bedrock units. Refer to the FORMATION attribute for the name of the geologic unit. Label a map with either the UNIT or FORMATION attribute. Refer to the DESCRIPTION attribute for a brief explanation of the geologic unit. For cartographic purposes, symbolize polygon features on a map using either the UNIT or TERRANE attribute, depending on the desired level of detail. Use the LITHO1, LITHO2, LITHO3, LITHO4, and LITHO5 for information about the lithology of the geologic unit. The Bedrock Geology layer also describes 17 classes of geologic boundaries, contacts and faults. Line feature attributes are primarily for cartographic purposes. For example, when symbolizing polygon features on different UNIT attribute values, also uniquely symbolize line features on the CLASS_COD or DEFINITION attribute to emphasize the various boundary types. When symbolizing polygon features on different TERRANE attribute values, also uniquely symbolize line features on the TERRB_COD or TERR_BNDRY to emphasize the terrain boundaries.
Entity_and_Attribute_Detail_Citation:
Bedrock Geology of Connecticut (Rogers, J., State of Connecticut, Department of Environmental Protection, 1985, scale 1:125,000)
Back to Top
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Department of Enviromental Protection
Contact_Address:
Address_Type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State_or_Province: Connecticut
Postal_Code: 06106-5127
Country: USA
Contact_Voice_Telephone: 860-424-3540
Contact_Facsimile_Telephone: 860-424-4058
Contact_Electronic_Mail_Address: dep.gisdata@ct.gov
Hours_of_Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Resource_Description: Connecticut Bedrock Geology Polygon
Distribution_Liability:
Although this data set  has been used by the State of Connecticut, Department of Environmental Protection, no warranty, expressed or implied, is made by the State of Connecticut, Department of Environmental Protection as to the accuracy of the data and or related materials.  The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the State of Connecticut, Department of Environmental Protection in the use of these data or related materials. The user assumes the entire risk related to the use of these data. Once the data is distributed to the user, modifications made to the data by the user should be noted in the metadata.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: Shapefile, Feature Class, ArcInfo Coverage
Format_Version_Number: ArcGIS
File_Decompression_Technique: Zip file
Transfer_Size: 4.358
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: http://www.ct.gov/deep
Fees: An online copy of the data may be accessed without charge.
Custom_Order_Process:
The data distributor does not provide custom GIS analysis or mapping services. Data is available in a standard format and may be converted to other formats, projections, coordinate systems, or selected for specific geographic regions by the party receiving the data.
Technical_Prerequisites:
Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.
Back to Top
Metadata_Reference_Information:
Metadata_Date: 20120125
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: State of Connecticut, Department of Environmental Protection
Contact_Person: Margaret Thomas
Contact_Address:
Address_Type: mailing and physical address
Address:
79 Elm Street
City: Hartford
State_or_Province: Connecticut
Postal_Code: 06106-5127
Country: USA
Contact_Voice_Telephone: 860-424-3540
Contact_Facsimile_Telephone: 860-424-4058
Contact_Electronic_Mail_Address: dep.gisdata@ct.gov
Hours_of_Service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: http://www.esri.com/metadata/esriprof80.html
Profile_Name: ESRI Metadata Profile
Back to Top