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GRANTS PASS, Ore. — Stone tools and human DNA from ancient caves in Oregon offer new evidence of how some of the first Americans spread through the continent: Quite apart from the better-known Clovis culture, a separate group occupied the West.

Archaeologists said Thursday that using multiple techniques, they have dated broken obsidian spear points from Paisley Caves to about 13,200 years ago, as old as much different stone tools from the Clovis culture found in the southeast and interior United States. Radio-carbon dating of human DNA from coprolites – ancient desiccated human feces – shows people lived in the caves as early as 14,300 years ago. READ MORE.

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