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Posted Wed Sep 1 2010: from PNAS, via BBC:
Mammoth-killing space blast 'off the hook'
The theory that the great beasts living in North America 13,000 years ago were killed off by a space impact can now be discounted, a new study claims. Mammoths, giant bears, big cats and the like disappeared rapidly from the fossil record, and a comet or asteroid strike was seen as a possible culprit. But tiny diamonds said to have been created in the collision have been misinterpreted, a US-UK team says. Without these diamonds, the theory falls, the group tells PNAS journal. "This was really the last pillar for this theory and I think it's time now everyone moved on," said co-author Professor Andrew Scott, from Royal Holloway, University of London, UK, told BBC News.
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