ScienceModern (2014 study, referencing Younger Dryas ~12,900 years ago)global (North/South America, Europe, Middle East)high confidence

Only 3 of the 29 archaeological sites re-examined by David Meltzer's team had dates falling within the onset of the Younger Dryas.

Notes on verification

Confirmed directly by the peer-reviewed PNAS paper's own text ('Only 3 of the 29 sites fall within the temporal window of the YD onset'), and independently corroborated by a secondary peer-reviewed article and a Sandia National Labs publication with consistent figures. [tier=gold indep_score=1.0 clusters=3 claim_tier=notable]

Sources