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.
Other ISGS map Series
Updated 10/5/2009 JKH