SciencePrehistoric (c. 12,900–11,600 years ago)global (most pronounced in North Atlantic region)high confidence

The Younger Dryas climate interval began in less than 100 years and lasted roughly 1,300 years, occurring approximately 12,900–11,600 years ago.

Notes on verification

Confirmed by multiple independent, high-quality sources (EBSCO, ScienceDirect, PNAS) with consistent dating and duration figures; minor variation in exact end date reflects normal scientific uncertainty. [tier=gold indep_score=0.983 clusters=3 claim_tier=notable]

Sources

The Younger Dryas climate interval began in less than 100… · DeepInquiry