Koster is situated on colluvial fans and located 8 km northeast of Hardin in Greene County, Illinois. Carbonized maize cupules, kernels, and glumes were identified in nine flotation samples representing four cultural horizons (9D to 9A), and two of these were dated, providing, what was at the time, a pioneering use of the AMS radiocarbon method to directly date maize (Conard et al. 1984:444).

ID Other ID Type Subtype Uncal BP (years) ± 1 σ (years) Median cal BP (years) Lower cal BP (years) Upper cal BP (years) δ13C Contaminated?
NSRL-295 MacroSample unknown 250 300 321 729 0 No
NSRL-296 MacroSample unknown 600 40 601 656 539 No

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References Cited

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.

Liu, C. L., D. L. Asch, B. W. Fisher and D. D. Coleman
    1992    Illinois State Geological Survey Radiocarbon Dates X. Radiocarbon 34(1):83-104.

Morlan, R. E. and M. Betts
    1999-2005 Canadian Archaeological Radiocarbon Database. http://www.canadianarchaeology.ca/. Canadian Museum of Civilization, Gatineau, Quebec.