Science2014 (research published); subject matter concerns ~12,900 years agoNorth and South America, Europe, Middle Easthigh confidence

A team led by David Meltzer of Southern Methodist University rechecked the dates from 29 archaeological sites cited as evidence for a cosmic collision associated with the Younger Dryas.

Notes on verification

Confirmed directly by the original 2014 PNAS peer-reviewed paper by Meltzer et al., and corroborated by independent secondary sources including Archaeology Magazine and subsequent review articles. [tier=gold indep_score=1.0 clusters=3 claim_tier=notable]

Sources