Illinois County Geologic Maps (ICGM)

The Illinois County Geologic Map (ICGM) series was initiated in 2007. This series may include a variety of geologic theme maps, such as bedrock geology, surficial geology, geologic cross sections, three-dimensional models, major aquifers, aquifer sensitivity to contamination, and others. ICGM series maps are available for sale as hard copy and as free downloadable graphics through this Web site. The maps in this series are extensively reviewed internally and externally and comply with ISGS cartograhpic standards at the time of public release.

Bureau County
Henry County
Kane County
Lake County
Lee County
Monroe County (not shown on map)
St. Clair County

Other ISGS map Series

Updated 06/19/2012 SLD