Another “extinction” theory

Tiny diamonds sprinkled across North America suggest a “swarm” of comets hit the Earth around 13,000 years ago, kicking up enough disruption to send the planet into a cold spell and drive mammoths and other creatures into extinction, scientists reported on Friday.

Doug Kennett of the University of Oregon and colleagues found the little diamonds at sites from Arizona to South Carolina and into Alberta and Manitoba in Canada.

They are buried at a level that corresponds to the beginning 12,900 years ago of the Younger Dryas, a 1,300-year-long cold spell during which North American mammoths, saber-toothed cats, camels and giant sloths became extinct.

These collisions produced, as they stated in the abstract to their paper, “multiple airbursts and possible surface impacts, with severe repercussions for plants, animals, and humans in North America.”

I am a bit confused, was the cold spell of extinction only in North America? How does this help to explain global changes? I suppose that is not what this research is about though, still it is quite interesting.

Now about those diamonds…? =o)

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