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Quote:News of the dating results is reported in Science magazine.
In truth, the "Clovis first" model, which holds to the idea that America's original human population swept across a land-bridge from Siberia some 13,000 years ago, has looked untenable for some time.
A succession of archaeological finds right across the United States and northern Mexico have indicated there was human activity much earlier than this - perhaps as early as 15-16,000 years ago.
Full article BBC News
http://www.bbc.co.uk/news/science-environment-15391388
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