The migration corridor formed by the retreating Cordilleran and Laurentide ice sheets was nearly 1,000 miles long.
Notes on verification
Confirmed by multiple independent sources including Smithsonian, National Geographic, Christian Science Monitor, and the original Nature study, all citing 900-1,000 mile (~1,500 km) length for the ice-free corridor. [tier=gold indep_score=0.838 clusters=4 claim_tier=notable]
Sources
- New Study Refutes Theory of How Humans Populated North America | HISTORY (seed:history_and_archaeology)
- https://www.nature.com/articles/nature19085 (corroboration)
- https://www.smithsonianmag.com/smart-news/humans-colonized-americas-along-coast-not-through-ice-180960103/ (corroboration)
- https://www.csmonitor.com/Science/2016/0810/A-final-blow-to-myth-of-how-people-arrived-in-the-Americas (corroboration)
- https://www.nationalgeographic.com/history/article/ice-free-corridor-first-americans-archaeology-migration (corroboration)