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.
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