The archaeological record shows a clear break between Clovis and Folsom cultures. Post-Younger Dryas, a different toolkit emerges. Different spear points, different lifestyles, different enough that archaeologists gave them a separate name long before anyone connected it to climate catastrophe. He suspects some Clovis populations survived and passed knowledge forward, but the material culture shifted. There was a hiatus, then something new. The literature documented this transition decades ago, not as speculation but as observable fact. What caused that break? The timing lines up with the Younger Dryas boundary, a period of rapid environmental upheaval that would have reshaped how people lived, what they hunted, and how they made tools. The change wasn't gradual. It was abrupt enough to leave a signature in stone.
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