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So far as we know, about 15,000 BPD (Before Present Day). Work continues at the Buttermilk Creek Complex, so the deeper they dig, the older the site proves to be. The site was dated using optically stimulated luminescence, a method used to date minerals because organics at the location did not preserve well.

Second runner up would be Clovis culture, who appeared around 11,500 years BPD according to radio carbon dating, a method used to date organic material.

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11y ago

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