A short and quick post, an old paper: Richard A. Rogers, (1984), The Donahue Locality: Evidence Suggesting a Pre-Wisconsin human presence in North America. Current Research in the Pleistocene Vol. 1, 1984. pp. 19. www.centerfirstamericans.com/crp/crp_pdf/1984_v1.pdf, tells of a stone tool that dates back to the Pre-Wisconsin period, that is, prior to the Wisconsin glacial event. It was dated by thermoluminiscence to an age of around 319,000 years, but it may be younger.
The biface is shown below:
A mammoth molar found in the area but in a younger layer of sediments was dated at 39,900 years BP by radiocarbon dating. So this tool is at least 40 ky old.
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