1. Alden, W. C. 1902. Description of the Chicago district, Illinois-Indiana. U.S. Geological Survey Atlas, Folio 81, Washington, D. C.
2. Atwood, W. W., and Goldthwait, J. W. 1908. Physical geography of the Evansto -Waukegan region. Illinois State Geological Survey Bul. 7, Urbana, Illinois.
3. The life of the Pleistocene or glacial period as recorded in deposits laid down by the great ice sheet;Baker;University of Illinois Bul.,1920
4. Bretz, J. H. 1939. Geology of the Chicago region Part 1-general. Illinois State Geological Survey Bui. 65, Part I, Urbana, Illinois.
5. Bretz, J. H. 1943. Chicago Areal Geologic Maps. Illinois State Geological Survey Map Folio, 24 sheets, scale 1:24,000, Urbana, Illinois.