Loren Davis first excavated Cooper's Ferry in 1997, finding western stemmed points whose associated bone and charcoal initially produced radiocarbon dates of up to 13,300 years old.
Notes on verification
Confirmed by multiple independent sources including Wikipedia, Smithsonian Magazine, OPB, and Grokipedia, consistent with published archaeological findings from Loren Davis's excavations at Cooper's Ferry. [cascade flags: wikipedia_dropped_other_sources_exist | tier=unverified indep_score=0.3 clusters=3 claim_tier=notable] [rescored 2026-09-15: curated origin-host map (PR #65); unclassified hosts no longer scored as aggregators]
Sources
- 15,000-year-old Idaho archaeology site now among America's oldest (seed:history_and_archaeology)
- https://www.smithsonianmag.com/smart-news/idaho-site-shows-humans-were-north-america-16000-years-ago-180973024/ (corroboration)
- https://www.opb.org/news/article/oregon-state-university-oldest-human-artifacts-idaho-north-america/ (corroboration)
- https://grokipedia.com/page/Cooper's_Ferry_site (corroboration)