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Aerial photograph of Horseshoe Lake area showing old meander scars.
Modified after Hajic, E.R. 1998. Appendix E: Geologic Investigations. In An Archaeological Survey of the Horseshoe Lake State Park, Madison County, Illinois, T.R. Pauketat, M.A. Rees, and Stephanie L. Pauketat, with contributions by E.R. Hajic and B. Koldehoff, pp. 137-147. Illinois State Museum Reports of Investigations, No. 55. Illinois State Museum, Springfield. Fig. E1, p.138.