Illinois geologic map data

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.


Show in a web browser window:

Show in Google Earth or other KML viewer:

ilgeol.kml (Uncompressed, 29.2M)

ilgeol.kmz (Compressed, 9.0M)

List geologic units by state or county

Show in your GIS using OGC web services: (WMS, version 1.3.0) (WFS, version 1.1.0)


Content Download Format
Geologic units and attributes SHP + CSV format



Outline - Questions & Answers - Plain text - XML
Legend indicating the meaning of colors on the interactive map



Willman, H.B., and others, (compilers), 1967, Geologic Map of Illinois: Illinois State Geological Survey, scale= 1:500,000, paper.

Related topics

Geologic units in Illinois