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Marine shell (Buscyon) from the Bobby Becker site near Cahokia - evidence of Cahokia's interaction with cultures of the Gulf and Atlantic Coast?
Pauketat, T.R., M.A. Rees, and Stephanie L. Pauketat, with contributions by E.R. Hajic and B. Koldehoff. 1998. An Archaeological Survey of the Horseshoe Lake State Park, Madison County, Illinois. Illinois State Museum Reports of Investigations, No. 55. Illinois State Museum, Springfield. Fig. B4, p.111
Image courtesy of the Illinois State Museum.