The Younger Dryas began at the end of the last Ice Age, approximately 12,800 years ago.
Notes on verification
Multiple independent scientific and encyclopedic sources, including peer-reviewed ice core data, consistently place the Younger Dryas onset at approximately 12,800-12,900 years ago, corroborating the claim. [cascade flags: aggregator_dropped_primary_exists | tier=silver indep_score=0.925 clusters=2 claim_tier=everyday]
Sources
- News - What Caused the Deep Freeze of the Younger Dryas? - Archaeology Magazine (seed:history_and_archaeology)
- https://www.ebsco.com/research-starters/earth-and-atmospheric-sciences/younger-dryas (corroboration)
- https://www.sciencedirect.com/science/article/abs/pii/S1040618211001480 (corroboration)