Mass human migrations into the Americas occurred around 13,400 years ago, roughly 1,000 years before the onset of the Younger Dryas.
Notes on verification
Confirmed by original Nature Geoscience paper (Smith, Elliott & Lyons 2010) and independently corroborated by university press release and independent science news coverage. [cascade flags: aggregator_dropped_primary_exists | tier=silver indep_score=1.0 clusters=2 claim_tier=notable]
Sources
- Mammoth-Belch Deficit Caused Prehistoric Cooling? (seed:history_and_archaeology)
- https://www.nature.com/articles/ngeo877 (corroboration)
- https://news.unm.edu/news/390 (corroboration)