Before the Younger Dryas, the Clovis culture was widespread across unglaciated North America, with more than 50 sites attributed to it. The culture lasted about 400 years.
Then, right around 12,900 years ago, at the onset of the Younger Dryas, those sites are abandoned. Randall's reading of the record is direct: the Clovis people apparently did not survive it. What happened at that moment to end a culture spread across a continent?