Excavation at Oregon site unearths ancient stone tool

March 6, 2015 7:24 AM

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Excavation at Oregon site unearths ancient stone tool

This undated photo provided by the University of Oregon Museum of Natural and Cultural History shows a scraper chipped out of agate found at an ancient rock shelter in the high desert of eastern Oregon. (AP)

Archaeologists unearthed a stone tool at an ancient rock shelter in Oregon that could be older than any known site of human occupation in western North America.

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