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Comet Wiped Out Early North American Culture, Animals, Study Says |
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The News -
Science-Astronomy
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June 09, 2007 |
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A comet exploded over North America about 13,000 years ago, causing a long bout of climate cooling, according to a controversial new theory presented today. The extraterrestrial impact may help explain massive mammal die-offs and the demise of one of the earliest American cultures. It would also be the first known extraterrestrial impact to affect modern humans. Evidence for the impact comes from a thin layer of sediment found throughout North America, said James Kennett, a geologist at the University of California in Santa Barbara. Source : National Geographic News
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