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Published online 14 October 2009 | Nature 461, 861 (2009) | doi:10.1038/461861a
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Impact theory under fire once more
Archaeologists fail to find evidence for comet explosion.
Independent studies are casting more doubt on a controversial theory that a comet exploded over North America nearly 13,000 years ago, wiping out the Clovis people and many of the continent's large animals.
Archaeologists have examined sediments at seven Clovis-age sites across the United States, and found that the concentration of magnetic debris was insufficient to confirm an extraterrestrial impact at that time, says a report in the Proceedings of the National Academy of Sciences (PNAS)1.
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