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Connecticut Bedrock Geology Line
SDE Feature Class - depgis.DEP.BEDROCK_GEOLOGY_LINE
FGDC, ESRI Metadata
DescriptionGraphicSpatialData StructureData QualityData SourceData DistributionMetadata
+ Resource Description
Citation
Information used to reference the data.
Title: Connecticut Bedrock Geology Line
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data type: vector digital data
Data location: http://www.ct.gov/deep
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.
Larger Work Citation
Title: Bedrock Geology of Connecticut
Originators: John Rodgers, Compiler
Publisher: Connecticut Geological and Natural History Survey, Connecticut Department of Environmental Protection in cooperation with the U.S. Geological Survey
Publication place: Hartford, Connecticut
Publication date: 1985
Data type: map
Data location: http://www.ct.gov/deep, http://cteco.uconn.edu/map_catalog/maps/state/Bedrock_Geologic_Map_of_Connecticut.pdf, http://www.usgs.gov
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.
Description
A characterization of the data, including its intended use and limitations.
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.
Dataset 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.
Language of dataset: en
Point Of Contact
Contact information for the individual or organization that is knowledgeable about the data.
Organization: State of Connecticut, Department of Environmental Protection
Person: Margaret Thomas
Phone: 860-424-3540
Fax: 860-424-4058
Email: dep.gisdata@ct.gov
Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Address type: mailing and physical address
Address: 
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106-5127
Country: USA
Data Type
How the data are represented, formatted and maintained by the data producing organization.
File or table name: depgis.DEP.BEDROCK_GEOLOGY_LINE
Data type: vector digital data
Data format: SDE Feature Class
Native dataset 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.
Time Period of Data
Time period(s) for which the data corresponds to the currentness reference.
Date: 1985
Currentness reference: 
publication date
Status
The state of and maintenance information for the data.
Data status: Complete
Update frequency: None planned
Key Words
Words or phrases that summarize certain aspects of the data.
Theme:
Keywords: geology, bedrock, lithology, rock type, geologic Age, geologic history, formation name, geologic terrane, plate tectonics, mineralogy, geologic sources
Keyword thesaurus: None
Theme:
Keywords: geoscientificInformation
Keyword thesaurus: ISO 19115 Topic Category
Place:
Keywords: Connecticut, CT
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:
Keywords: United States of America, USA
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.
Data Access Constraints
Restrictions and legal prerequisites for accessing or using the data after access is granted.
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.
+ Graphic Example
Browse Graphic
Graphic illustration of the data.
Browse graphic 1
Open - Full view of Bedrock Geology - Bedrock Geology Polygon features symbolized by the (geologic) UNIT attribute.
Graphic Image
Browse graphic 2
Open - 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.
Graphic Image
Browse graphic 3
Open - 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.
Graphic Image
+ Spatial Reference Information
Horizontal Coordinate System
Reference system from which linear or angular quantities are measured and assigned to the position that a point occupies.
Projected coordinate system:
Name: NAD 1983 StatePlane Connecticut FIPS 0600 Feet
Map units: survey feet
Geographic coordinate system:
Name: GCS North American 1983
Coordinate System Details
Map projection
Map projection name: 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
Reference system from which vertical distances (altitudes or depths) are measured.
Altitude system definition:
Altitude resolution: 1.000000
Altitude encoding method: Explicit elevation coordinate included with horizontal coordinates
Spatial Domain
The geographic areal domain of the data that describes the western, eastern, northern, and southern geographic limits of data coverage.
Bounding Coordinates
In Projected or local coordinates
NAD 1983 StatePlane Connecticut FIPS 0600 Feet
BoundaryCoordinate
Left730529.813000 (survey feet)
Right1263094.375000 (survey feet)
Top944279.188000 (survey feet)
Bottom544018.813000 (survey feet)
In Unprojected coordinates (geographic)
GCS North American 1983
BoundaryCoordinate
West-73.742107 (longitude)
East-71.781365 (longitude)
North42.052612 (latitude)
South40.949970 (latitude)
+ Data Structure and Attribute Information
Overview
Summary of the information content of the data, including other references to complete descriptions of entity types, attributes, and attribute values for the data.
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 detailed citation: 
Bedrock Geology of Connecticut (Rogers, J., State of Connecticut, Department of Environmental Protection, 1985, scale 1:125,000)
Direct spatial reference method: Vector
Indirect spatial reference method: State of Connecticut, United States of America
Attributes of Connecticut Bedrock Geology Line
Detailed descriptions of entity type, attributes, and attribute values for the data.
Name: depgis.DEP.BEDROCK_GEOLOGY_LINE
Type of object: Feature Class
Geometry type: Polyline
Number of records: 5550
Description: 
Bedrock Geology contacts, faults and limits of mapping represented as line features.
Source: 
State of Connecticut, Department of Environmental Protection
Attributes
OBJECTID
Definition: 
Internal feature number.
Alias: OBJECTID Type: OID Width: 4 Precision: 10 Scale: 0
Attribute values: Sequential unique whole numbers that are automatically generated.
Attribute definition source: 
ESRI
SHAPE
Definition: 
Feature geometry.
Alias: SHAPE Type: Geometry Width: 4 Precision: 0 Scale: 0
Attribute values: Coordinates defining the features.
Attribute definition source: 
ESRI
CLASS_COD
Definition: 
Bedrock Line Class - Describes the type of bedrock lines mapped. Classes include contacts, faults of various types, cartographic boundaries, and limits of mapping.
Alias: CLASS_COD Type: String Width: 3 Precision: 0 Scale: 0Output width: 3
Attribute domain values
ValueDefinition
B 
Boundary
Definition Source: 
compiler
BC 
Cartographic Boundary - Line introduced to close a polygon
Definition Source: 
compiler
C 
Geologic Contact
Definition Source: 
compiler
CQT 
Contact with a questionable termination
Definition Source: 
compiler
F 
Fault
Definition Source: 
compiler
FA 
Fault approximately located
Definition Source: 
compiler
FC 
Fault Questionable - Otherwise interpret as a contact
Definition Source: 
compiler
FH 
High angle fault, mostly Jurassic
Definition Source: 
compiler
FQT 
Fault with a questionable termination
Definition Source: 
compiler
FS 
Strike-slip fault
Definition Source: 
compiler
FT 
Thrust fault, mostly Devonian or Ordovician
Definition Source: 
compiler
FTD 
Folded and overturned thrust fault - deformed
Definition Source: 
compiler
FTF 
Folded thrust fault
Definition Source: 
compiler
FTK 
Klippe or Outlier of upper plate of thrust fault
Definition Source: 
compiler
FTO 
Overturned thrust fault
Definition Source: 
compiler
FTW 
Window or Inlier through upper plate of thrust fault
Definition Source: 
compiler
L 
Limit of bedrock mapping
Definition Source: 
compiler
Attribute definition source: 
State of Connecticut, Department of Environmental Protection
DEFINITION
Definition: 
Bedrock Line Class Definition - Text values that correspond to the numeric CLASS attribute values. DEFINITION is the English language equivalent of (decodes) the CLASS field.
Alias: DEFINITION Type: String Width: 80 Precision: 0 Scale: 0Output width: 80
Attribute values: See Enumerated Domain Value Definitions for CLASS attribute.
Attribute definition source: 
State of Connecticut, Department of Environmental Protection
AV_LEGEND
Definition: 
ArcView Legend. A text field to easily classify and symbolize bedrock line types on a map.
Alias: AV_LEGEND Type: String Width: 10 Precision: 0 Scale: 0Output width: 10
Attribute domain values
ValueDefinition
Boundary 
Inludes CLASS attribute value B.
Definition Source: 
compiler
Contact 
Includes CLASS attribute values C and CQT.
Definition Source: 
compiler
Fault 
Includes CLASS attribute values F, FA, FC, FH, FQT, FQT, FS, FT, FTD, FTF, FTK, FTO, and FTW.
Definition Source: 
compiler
Map Limit 
Inludes CLASS attribute value L.
Definition Source: 
compiler
No Show 
Inludes CLASS attribute value BC.
Definition Source: 
compiler
Attribute definition source: 
State of Connecticut, Department of Environmental Protection
TERRB_COD
Definition: 
Terrane Boundary Code - Identifies and describes the significant geologic terrane boundaries, including the Eastern Border Fault, the Lake Char/Honey Hill Fault,  and Cameron's Line.
Alias: TERRB_COD Type: SmallInteger Width: 2 Precision: 5 Scale: 0Output width: 2
Attribute domain values
ValueDefinition
0 
Not a terrane boundary
Definition Source: 
compiler
1 
Cameron's Line
Definition Source: 
compiler
2 
East Derby Fault
Definition Source: 
compiler
3 
Eastern Border Fault
Definition Source: 
compiler
4 
Faults Beneath Taconic Allochthons
Definition Source: 
compiler
5 
Faults Beneath Taconic Allochthons - inferred
Definition Source: 
compiler
6 
Honey Hill Fault
Definition Source: 
compiler
7 
Lake Char Fault
Definition Source: 
compiler
9 
Western Border Fault
Definition Source: 
compiler
10 
Willimantic Window
Definition Source: 
compiler
Attribute definition source: 
State of Connecticut, Department of Environmental Protection
TERR_BNDRY
Definition: 
Terrane Boundary - Text values that correspond to numeric TERR_COD attribute values. TERR_BNDRY is the English language equivalent of (decodes) the TERRB_COD field.
Alias: TERR_BNDRY Type: String Width: 50 Precision: 0 Scale: 0Output width: 50
Attribute values: See Enumerated Domain Value Definitions for TERRB_COD attribute.
Attribute definition source: 
State of Connecticut, Department of Environmental Protection
SHAPE.len
Alias: SHAPE.len Type: Double Width: 0 Precision: 0 Scale: 0
ESRI Feature Description
Description of spatial objects in the data using the Environmental Systems Research Institute (ESRI) terminology.
Environmental Systems Research Institute (ESRI) terms
depgis.DEP.BEDROCK_GEOLOGY_LINE
ESRI feature type: Simple
Geometry type: Polyline
Topology: FALSE
Feature count: 5550
Spatial index: TRUE
Linear referencing: FALSE
SDTS Feature Description
Description of point and vector spatial objects in the data using the Spatial Data Transfer Standards (SDTS) terminology.
Spatial data transfer standard (SDTS) terms
depgis.DEP.BEDROCK_GEOLOGY_LINE
Type: String
Count: 5550
+ Data Quality and Accuracy Information
General
Information about the fidelity of relationships, data quality and accuracy tests, omissions, selection criteria, generalization, and definitions used to derive the data.
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.
Attribute Accuracy
Accuracy of the identification of data entities, features and assignment of attribute values.
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.
Positional Accuracy
Accuracy of the positional aspects of the data.
Horizontal accuracy report: 
The horizontal positional accuracy of this data is unknown.
+ Data Source and Process Information
Data Sources
Information about the source data used to construct or derive the data.
Data source information
Source 1 - Source Materials (listed by quad)
Title: Source Materials (listed by 7.5 minute quad)
Originators: Connecticut Geological and Natural History Survey, Department of Environmental Protection, State of Connecticut (CGNHS)
United States Geological Survey, Department of the Interior (USGS)
New York State Museum Map and Chart Series, Education Department, State of New York (NYSMMC)
Unpublished manuscript including theses and manuscripts by various authors
Publisher: varies according to source material
Publication place: varies according to source material
Publication date: varies according to source material
Data type: map
Other citation details: 
Source materials include geologic quadrangle maps, quarangle reports, reports of investigations, open file reports, unpublished manuscripts including theses, and guidebooks.
Map scale denominator: 24000
Media: paper
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
Beginning date: 1951
Ending date: 1985
Currentness reference: 
publication date
Source 1 - Source Materials (listed by author)
Title: Source Materials (listed by author)
Originators: Connecticut Geological and Natural History Survey, Department of Environmental Protection, State of Connecticut (CGNHS)
United States Geological Survey, Department of the Interior (USGS)
New York State Museum Map and Chart Series, Education Department, State of New York (NYSMMC)
Unpublished manuscript including theses and manuscripts by various authors
Publisher: varies according to source material
Publication place: varies according to source material
Publication date: varies according to source material
Data type: map
Other citation details: 
Source materials include geologic quadrangle maps, quarangle reports, reports of investigations, open file reports, unpublished manuscripts including theses, and guidebooks.
Map scale denominator: 24000
Media: paper
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.
Beginning date: 1951
Ending date: 1985
Currentness reference: 
publication date
Source 2 - Regional Compilation Sheets
Title: Compilation Sheets
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data type: map
Map scale denominator: 50000
Media: transparency
Source contribution: 
1:50,000-scale mylar overlay compilation sheets used to publish the Bedrock Geological Map of Connecticut, 1985.
Date: 1985
Currentness reference: 
publication date
Source 3 - Bedrock Geology Layer
Title: Connecticut Bedrock Geology
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 50000
Media: disc
Source contribution: 
Bedrock Geology Layer is in ArcInfo coverage format having both polygon and line features.
Date: 1985
Currentness reference: 
publication date
Source 4 - Bedrock_Geology_Line.shp
Title: Connecticut Bedrock Geology Line
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 50000
Media: disc
Source contribution: 
Includes all line features from Source 3  - Bedrock Geology Layer (ArcInfo Coverage format). Bedrock_Geology_Line.shp is in Shapefile format.
Date: 1985
Currentness reference: 
publication date
Source 5 - Bedrock_Geology_Line
Title: Connecticut Bedrock Geology Line
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data location: http://www.ct.gov/deep
Map scale denominator: 50000
Media: disc
Source contribution: 
Bedrock_Geology_Line is in GeoDatabase Feature Class format.
Date: 1985
Currentness reference: 
publication date
Process Steps
Information about events, parameters, tolerances and techniques applied to construct or derive the data.
Process step information
Process Step 1
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.
Person: John Rodgers, Compiler with assistance from Robert Altamara, Nancy Davis, Craigh Dietsch, Nat Gibbons, Sidney Quarier, Margaret Thomas
Organization: State of Connecticut, Department of Environmental Protection
Phone: 860-424-3540
Address type: mailing and physical address
Address: 
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: Unknown
Data Source used
Source 1 - Source Materials (listed by quad)
Title: Source Materials (listed by 7.5 minute quad)
Originators: Connecticut Geological and Natural History Survey, Department of Environmental Protection, State of Connecticut (CGNHS)
United States Geological Survey, Department of the Interior (USGS)
New York State Museum Map and Chart Series, Education Department, State of New York (NYSMMC)
Unpublished manuscript including theses and manuscripts by various authors
Publisher: varies according to source material
Publication place: varies according to source material
Publication date: varies according to source material
Data type: map
Other citation details: 
Source materials include geologic quadrangle maps, quarangle reports, reports of investigations, open file reports, unpublished manuscripts including theses, and guidebooks.
Map scale denominator: 24000
Media: paper
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
Beginning date: 1951
Ending date: 1985
Currentness reference: 
publication date
Source 1 - Source Materials (listed by author)
Title: Source Materials (listed by author)
Originators: Connecticut Geological and Natural History Survey, Department of Environmental Protection, State of Connecticut (CGNHS)
United States Geological Survey, Department of the Interior (USGS)
New York State Museum Map and Chart Series, Education Department, State of New York (NYSMMC)
Unpublished manuscript including theses and manuscripts by various authors
Publisher: varies according to source material
Publication place: varies according to source material
Publication date: varies according to source material
Data type: map
Other citation details: 
Source materials include geologic quadrangle maps, quarangle reports, reports of investigations, open file reports, unpublished manuscripts including theses, and guidebooks.
Map scale denominator: 24000
Media: paper
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.
Beginning date: 1951
Ending date: 1985
Currentness reference: 
publication date
Data Source produced
Source 2 - Regional Compilation Sheets
Title: Compilation Sheets
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data type: map
Map scale denominator: 50000
Media: transparency
Source contribution: 
1:50,000-scale mylar overlay compilation sheets used to publish the Bedrock Geological Map of Connecticut, 1985.
Date: 1985
Currentness reference: 
publication date
Process Step 2
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.
Organization: State of Connecticut, Department of Environmental Protection
Person: Margaret Thomas
Phone: 860-424-3540
Address type: mailing and physical address
Address: 
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 2000
Process software and version: ArcInfo 7
Data Source used
Source 2 - Regional Compilation Sheets
Title: Compilation Sheets
Originators: State of Connecticut, Department of Environmental Protection
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data type: map
Map scale denominator: 50000
Media: transparency
Source contribution: 
1:50,000-scale mylar overlay compilation sheets used to publish the Bedrock Geological Map of Connecticut, 1985.
Date: 1985
Currentness reference: 
publication date
Data Source produced
Source 3 - Bedrock Geology Layer
Title: Connecticut Bedrock Geology
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 50000
Media: disc
Source contribution: 
Bedrock Geology Layer is in ArcInfo coverage format having both polygon and line features.
Date: 1985
Currentness reference: 
publication date
Process Step 3
Process description: 
Export to Shapefile format - Converted line feature data from an ArcInfo coverage named BEDROCK to a Shapefile named Bedrock_Geology_Line.shp. Excluded the FNODE#, TNODE#, LPOLY#, RPOLY#, LENGTH, BEDROCK#, BEDROCK-ID attributes from the Shapefile because their values are only maintained by ArcInfo software with spatial data that is ArcInfo coverage format.
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Phone: 860-424-3540
Address type: mailing and physical address
Address: 
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 20051206
Process software and version: ArcView 3.3
Data Source used
Source 3 - Bedrock Geology Layer
Title: Connecticut Bedrock Geology
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 50000
Media: disc
Source contribution: 
Bedrock Geology Layer is in ArcInfo coverage format having both polygon and line features.
Date: 1985
Currentness reference: 
publication date
Data Source produced
Source 4 - Bedrock_Geology_Line.shp
Title: Connecticut Bedrock Geology Line
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 50000
Media: disc
Source contribution: 
Includes all line features from Source 3  - Bedrock Geology Layer (ArcInfo Coverage format). Bedrock_Geology_Line.shp is in Shapefile format.
Date: 1985
Currentness reference: 
publication date
Process Step 4
Process description: 
Convert to GeoDatabase Feature Class format - Defined new Feature Class named Bedrock_Geology_Line; and imported the attribute definitions, loaded features and imported metadata from Bedrock_Geology_Line.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
Organization: State of Connecticut, Department of Environmental Protection
Person: Howie Sternberg
Phone: 860-424-3540
Address type: mailing and physical address
Address: 
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106
Country: USA
Process date: 20061106
Process software and version: ArcGIS 9.1
Data Source used
Source 4 - Bedrock_Geology_Line.shp
Title: Connecticut Bedrock Geology Line
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data type: vector digital data
Data location: http://www.ct.gov/deep
Map scale denominator: 50000
Media: disc
Source contribution: 
Includes all line features from Source 3  - Bedrock Geology Layer (ArcInfo Coverage format). Bedrock_Geology_Line.shp is in Shapefile format.
Date: 1985
Currentness reference: 
publication date
Data Source produced
Source 5 - Bedrock_Geology_Line
Title: Connecticut Bedrock Geology Line
Originators: State of Connecticut, Department of Environmental Protection (data compiler, editor and publisher)
Publisher: State of Connecticut, Department of Environmental Protection
Publication place: Hartford, Connecticut, USA
Publication date: 1985
Data location: http://www.ct.gov/deep
Map scale denominator: 50000
Media: disc
Source contribution: 
Bedrock_Geology_Line is in GeoDatabase Feature Class format.
Date: 1985
Currentness reference: 
publication date
ESRI geoprocessing history
Description of ESRI geoprocessing commands, settings, and tolerances applied to the data.
ESRI geoprocessing command information
1 Process
Date: 20061204 Time: 134407
Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyFeatures
Command issued: CopyFeatures F:\GeoData\geology\geodatabase\Geology.mdb\Bedrock_Geology_Line "Database Connections\depdbs11@dep.sde\depgis.DEP.Bedrock_Geology_Line" DEPVECTORSTATIC 10000 0 0
2 CopyFeatures_18
Date: 20081215 Time: 154702
Tool location: C:\Program Files\ArcGIS\ArcToolbox\Toolboxes\Data Management Tools.tbx\CopyFeatures
Command issued: CopyFeatures "Database Connections\10.18.8.94.depgis@DEP.sde\depgis.DEP.BEDROCK_GEOLOGY_LINE" "Database Connections\062174-svr.depgis@DEP.sde\depgis.DEP.BEDROCK_GEOLOGY_LINE" DEPFEATURESTATIC 0 0 0
+ Data Distribution Information
General
Description of the data known by the party from whom the data may be obtained, liability of party distributing data, and technical capabilities required to use the data.
Resource description: 
Connecticut Bedrock Geology Line
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.
Technical prerequisites: 
Geographic information sytem (GIS), computer-aided drawing or other mapping software is necessary to display, view and access the information.
Distribution Point of Contact
Contact information for the individual or organization distributing the data.
Organization: State of Connecticut, Department of Enviromental Protection
Phone: 860-424-3540
Fax: 860-424-4058
Email: dep.gisdata@po.state.ct.us
Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Address type: mailing and physical address
Address: 
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106-5127
Country: USA
Standard Order Process
Common ways in which data may be obtained.
Digital form:
Format name: Shapefile, Feature Class, ArcInfo Coverage
Format version number: ArcGIS
Size of the data: 2.519
Transfer size: 2.519
File decompression technique: Zip file
Digital transfer option:
Online option:
Computer 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
Description of custom distribution services available.
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.
+ Metadata Reference
Metadata Date
Dates associated with creating, updating and reviewing the metadata.
Last updated: 20120125
Language of metadata: en
Metadata Point of Contact
Contact information for the individual or organization responsible for the metadata information.
Organization: State of Connecticut, Department of Environmental Protection
Person: Margaret Thomas
Phone: 860-424-3540
Fax: 860-424-4058
Email: dep.gisdata@ct.gov
Hours of service: Monday to Friday, 08:30 to 16:30 Eastern Standard Time
Address type: mailing and physical address
Address: 
79 Elm Street
City: Hartford
State or Province: Connecticut
Postal code: 06106-5127
Country: USA
Metadata Standards
Description of the metadata standard used to document the data and reference to any additional extended profiles to the standard used by the metadata producer.
Standard name: FGDC Content Standards for Digital Geospatial Metadata
Standard version: FGDC-STD-001-1998
Time convention: local time
Metadata profiles defining additonal information:
Profile: ESRI Metadata Profile
Online linkage: http://www.esri.com/metadata/esriprof80.html
FGDC Plus Metadata Stylesheet
Stylesheet: FGDC Plus Stylesheet
File name: FGDC Plus.xsl
Version: 2.2
Description: This metadata is displayed using the FGDC Plus Stylesheet, which is an XSL template that can be used with ArcGIS software to display metadata. It displays metadata elements defined in the Content Standard for Digital Geospatial Metadata (CSDGM) - aka FGDC Standard, the ESRI Profile of CSDGM, the Biological Data Profile of CSDGM, and the Shoreline Data Profile of CSDGM. CSDGM is the US Federal Metadata standard. The Federal Geographic Data Committee originally adopted the CSDGM in 1994 and revised it in 1998. According to Executive Order 12096 all Federal agencies are ordered to use this standard to document geospatial data created as of January, 1995. The standard is often referred to as the FGDC Metadata Standard and has been implemented beyond the federal level with State and local governments adopting the metadata standard as well. The Biological Data Profile broadens the application of the CSDGM so that it is more easily applied to biological data that are not explicitly geographic (laboratory results, field notes, specimen collections, research reports) but can be associated with a geographic location. Includes taxonomical vocabulary. The Shoreline Data Profile addresses variability in the definition and mapping of shorelines by providing a standardized set of terms and data elements required to support metadata for shoreline and coastal data sets. The FGDC Plus Stylesheet includes the Dublin Core Metadata Element Set. It supports W3C DOM compatible browsers such as IE7, IE6, Netscape 7, and Mozilla Firefox. It is in the public domain and may be freely used, modified, and redistributed. It is provided "AS-IS" without warranty or technical support.
Instructions: On the top of the page, click on the title of the dataset to toggle opening and closing of all metadata content sections or click section links listed horizontally below the title to open individual sections. Click on a section name (e.g. Description) to open and close section content. Within a section, click on a item name (Status, Key Words, etc.) to open and close individual content items. By default, the Citation information within the Description section is always open for display.
Download: FGDC Plus Stylesheet is available from the ArcScripts downloads at www.esri.com.
Federal Geographic Data Committee