Poorly finished shell beads (examples of various stages of manufacture?) from Bobby Becker site.

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. B5, p.111

Image courtesy of the Illinois State Museum.