- Geology of Illinois
Bedrock Geology of Illinois
The bedrock strata of
Illinois is dominated byPennsylvanian age rocks which occur within the Illinois Basin.Illinois Basin
The llinois Basin is a northwest-southeast asymmetrical structural
depression that is filled with more than 4000 meters ofPaleozoic sedimentary rocks. Thebasin is to the north by theMississippi River and theKankakee Arch , to the east by theCincinnati Arch , and to the south by theOzark uplift andPascola Arch [* [http://pubs.usgs.gov/pp/p1151h/ McDowell, R.C., (ed.), 2001, The geology of Kentucky -- A text to accompany the geologic map of Kentucky: USGS Professional Paper 1151-H, 68 p.] ] .Rocks
The oldest rocks exposed in Illinois, are
Cambrian , and occur along theRock River inOgle County . The youngest are Tertiary (Eocene ) and occur in southwestern Illinois.Cretaceous Period sediments onlap the Paleozic units in extreme southern Illinois.A
bedrock geologic map was published by Kolata et al, 2005 and is available at theIllinois State Geological Survey [ [http://www.isgs.uiuc.edu/maps-data-pub/latest-sw.shtml#IM14 Kolata, D.R.(compiler) 2005, Bedrock Geology of Illinois, Illinois State Geological Survey, Illinois Map 14, 1:500,000 scale. Contributions by: Denny, F.B., Devera, J.A., Hansel, A.K., Jacobson, R.J., Lasemi, Z., McGarry, C.S., Nelson, W.J., Norby, R.D., Treworgy, C.G., and Weibel, C.P.] ]References
United States topic
title =Geology of the United States by political division
prefix = Geology of
Wikimedia Foundation. 2010.