Ice Age Ends Smashingly: Did a comet blow up over eastern Canada?

By Sid Perkins, 15:57 PM April 15, 2008

Evidence unearthed at more than two dozen sites across North America suggests that an extraterrestrial object exploded in Earth's atmosphere above Canada about 12,900 years ago, just as the climate was warming at the end of the last ice age. The explosion sparked immense wildfires, devastated North America's ecosystems and prehistoric cultures, and triggered a millennium-long cold spell, scientists say.

At sites stretching from California to the Carolinas and as far north as Alberta and Saska...

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