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Illinois geologic map data

Online link https://mrdata.usgs.gov/geology/state/state.php?state=IL
Description A GIS database of geologic units and structural features in Illinois, with lithology, age, data structure, and format written and arranged just like the other states.
Publication U.S. Geological Survey Open-File Report 2004-1355

Related topics

Bedrock geologic units, Geologic contacts, Geologic maps, Geologic structure, Geology, Geospatial datasets, Map interfaces, Surficial geologic units, ArcInfo interchange, Comma-delimited text, OGC WFS, OGC WMS, Shapefile

States or counties

Illinois
Geologic units and structural features, mercator projection
Geologic units and structural features, mercator projection