Archaeologists found a bifacial stone knife and other stone artifacts at Florida's underwater Page-Ladson site dated to 14,550 years ago, about 1,500 years before Clovis points spread around 13,000 years ago.
Notes on verification
Confirmed by peer-reviewed Science Advances publication (Halligan et al. 2016) and corroborated by multiple independent science outlets (AAAS, ScienceDaily, Earth Magazine). [cascade flags: aggregator_dropped_primary_exists | tier=silver indep_score=0.867 clusters=3 claim_tier=exceptional]
Sources
- Discovery Points to Earlier Arrival of First Americans (seed:history_and_archaeology)
- https://www.science.org/doi/10.1126/sciadv.1600375 (corroboration)
- https://www.earthmagazine.org/article/underwater-archaeology-reveals-pre-clovis-people-butchered-mastodon-florida/ (corroboration)
- https://www.aaas.org/news/stone-tools-butchered-mastodon-prehistoric-site-florida-confirm-pre-clovis-peopling-americas (corroboration)