Geology

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  Bedrock Geology, 1967
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  Bedrock Geology, 2005
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  Bedrock Topography
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  Bedrock Valleys
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  Driftless Areas
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  Elevation of the Base of the Barlow Limestone
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  Elevation of the Karnak Limestone
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  Elevation of the New Albany Shale
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  Geologic and Geophysical maps of the Ozark, Illinois, Indiana, and Kentucky (OIINK) Region
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  Glacial Boundaries
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  Glacial Drift Thickness and Character
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  Illinois Borehole Temperatures
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  Illinois Drill Stem Tests
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  Illinois Waterflood Units 1946-2002
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  Illinois Well Headers
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  Illinois Well Logs
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  Illinois Well Tests
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  ISGS Field Notes
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  Location Points from the ISGS Wells and Borings Database
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  Moraines (End Moraines) of the Wisconsin Episode
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  Oil, Gas, and Gas Storage Fields in Illinois, 2002
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  Oil, Gas, and Gas Storage Fields in Illinois, 2023
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  Physiographic Divisions
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  Quaternary Deposits, 1979
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  Quaternary Deposits, 1996
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  Soil Associations Map (500K)
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  Stack-Unit Mapping of Geologic Materials to a Depth of 15 meters
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  Structural Features: Anticlines, Synclines, and Monoclines
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  Structural Features: Faults, Grabens, and Flexures
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  Structural Features: Polygon and Point Features