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Geologic Maps

Geologic maps listed here are available in pdf format. GIS data available where indicated, in GeMS [National Geologic Map Schema] geodatabase format. GeMS format zip files include geodatabases, open data format shapefiles, pdf map layouts, and supplemental information. 
Additional maps not listed may be available through the Connecticut Geological Survey.

state map

Statewide Maps:

Bedrock Geologic Map (1985)  [GIS data, 94M]
Generalized Bedrock Map (8.5 x 11" letter size)
Surficial Materials Map (1992)
Quaternary Geologic Map of Connecticut and Long Island Sound Basin (2005)
Bedrock Mines and Quarries Map (1986) superseded by Bedrock Mining Sites Database (CGNHS Bull. 119, 2022)

Published Quadrangle Maps:

State Geological Survey Quadrangle Reports: Comprehensive peer reviewed geologic reports with maps for 7.5 minute quadrangle areas.
USGS Geologic Quadrangles and Other Published Maps

Unpublished Maps:
Open File Bedrock Maps
: Preliminary geologic maps, considered provisional pending peer review. Some have GIS data available. 
Other archival maps

Other state and town maps available through a cooperative arrangement between DEEP and UConn:



State Geological & Natural History Survey Surplus Publications are available and free to educators.

Content last updated November 1, 2022