The Page-Ladson site lies in a 30-foot-deep sinkhole in Florida's Aucilla River, which during the late Pleistocene—when sea levels were approximately 300 feet lower—was a spring-fed pond rather than part of a river.
Notes on verification
Well-documented archaeological/paleontological site with peer-reviewed publications (Science Advances) and multiple independent corroborating sources including academic and museum references. [cascade flags: wikipedia_dropped_other_sources_exist | tier=silver indep_score=0.9 clusters=4 claim_tier=notable]
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.researchgate.net/publication/260135500_First_Floridians_and_Last_Mastodons_The_Page-Ladson_Site_in_the_Aucilla_River (corroboration)
- https://www.floridamuseum.ufl.edu/vertpaleo/aucilla-river-prehistory-project/ (corroboration)
- https://www.greenepublishing.com/our-aucilla-river-has-bones/ (corroboration)