Geology

• 
  Bedrock Geology, 1967
• 
  Bedrock Geology, 2005
• 
  Bedrock Topography
• 
  Bedrock Valleys
• 
  Driftless Areas
• 
  Elevation of the Base of the Barlow Limestone
• 
  Elevation of the Karnak Limestone
• 
  Elevation of the New Albany Shale
• 
  Geologic and Geophysical maps of the Ozark, Illinois, Indiana, and Kentucky (OIINK) Region
• 
  Glacial Boundaries
• 
  Glacial Drift Thickness and Character
• 
  Illinois Borehole Temperatures
• 
  Illinois Drill Stem Tests
• 
  Illinois Waterflood Units 1946-2002
• 
  Illinois Well Headers
• 
  Illinois Well Logs
• 
  Illinois Well Tests
• 
  ISGS Field Notes
• 
  Location Points from the ISGS Wells and Borings Database
• 
  Moraines (End Moraines) of the Wisconsin Episode
• 
  Oil, Gas, and Gas Storage Fields in Illinois, 2002
• 
  Oil, Gas, and Gas Storage Fields in Illinois, 2024
• 
  Physiographic Divisions
• 
  Quaternary Deposits, 1979
• 
  Quaternary Deposits, 1996
• 
  Soil Associations Map (500K)
• 
  Stack-Unit Mapping of Geologic Materials to a Depth of 15 meters
• 
  Structural Features: Anticlines, Synclines, and Monoclines
• 
  Structural Features: Faults, Grabens, and Flexures
• 
  Structural Features: Polygon and Point Features