URL: https://museum.state.il.us/RiverWeb/landings/Ambot/prehistory/archives/maps/pages/physiob.jpg.html

Click on the image to see a listing of pages that reference this illustration. Or you can browse the archives for this section.

Physiographic Divisions of Illinois.

Leighton, M. M., G. E. Ekblaw, and L. Horberg 1948. Physiographic Divisions of Illinois. ISGS Report of Investigations, No. 129. Illinois State Geological Survey, Champaign, Illinois. SEE ALSO https://www.isgs.uiuc.edu/isgsroot/isgshome/fra3.htm

Image courtesy of Illinois Department of Natural Resources & the Illinois State Geological Survey.