56E1-03, 56E2-03B. A kernel and cupule fragment were dated. Both are from a pit in the site's unstratified midden (Conard et al. 1984:445).
Conard, N., D. L. Asch, N. B. Asch, D. Elmore, H. Gove, M. Rubin, J. A. Brown, M. D. Wiant, K. B. Farnsworth and T. G. Cook 1984 Accelerator Radiocarbon Dating of Evidence for Prehistoric Horticulture in Illinois. Nature 308(5958):443-446.
Crawford, G. W., D. G. Smith and V. E. Bowyer 1997 Dating the Entry of Corn (Zea mays) into the Lower Great Lakes Region. American Antiquity 62(1):112-119.