New Evidence for the Antiquity of Man in North America Deduced from Aspartic Acid Racemization

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Science  17 May 1974:
Vol. 184, Issue 4138, pp. 791-793
DOI: 10.1126/science.184.4138.791


Ages of several Californzia Paleo-Indlian skeletons have been deduced from the extent of aspartic acid racemization. These dates suggest that man was present in North America at least 50,000 years before the present.