DataSummaryDistribution and extent of the bedrock geologic units within Illinois. Data are as depicted on the map Bedrock Geology of Illinois (2005) by D. Kolata (compiler). ISGS, 2007. Metadata IL Bedrock Geology 2005.htmlYour browser does not support iframes, but you can use the following link. Link DataZip Data: IL Bedrock Geology 2005.zip Serviceshttps://data.isgs.illinois.edu/arcgis/rest/services/Geology/Bedrock_Geology_500K_2005/MapServer ViewerOpen application in new browser windowYour browser does not support iframes, but you can use the following link. Link