Ages of several California Paleo-Indian 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.
No takes yet. Share an insight, caveat, or question.
Bada et al. (1974) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: