Before discoveries such as Cooper's Ferry, Clovis stone tools, generally about 13,000 years old, were considered the earliest human technology in the Americas.
Sources
- 15,000-year-old Idaho archaeology site now among America's oldest (nationalgeographic.com)
- https://news.oregonstate.edu/news/new-artifacts-suggest-first-people-arrived-north-america-earlier-previously-thought (news.oregonstate.edu)
- https://www.archaeology.org/issues/366-2001/trenches/8240-digs-idaho-coopers-ferry (archaeology.org)
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