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Mystery Of The Longest
Surviving Mammoths

By Tim Radford
Science Editor
The Guardian - UK
6-22-4
 
In China, farmers had begun to plant rice. The first orange groves were bearing fruit in India, the North Africans had domesticated the cat and large communities in Mesopotamia had begun to rear cattle, keep accounts and use tokens. Across the Atlantic, settlers in the Tehuacan valley of Mexico already grew corn, squash, beans and peppers and in Neolithic Britain hunters speared salmon, gathered hazel nuts and made huts covered with hide. In Thessaly, Crete and the Cyclades, the earliest Greeks had begun to cultivate wheat, barley and lentils.
 
And on an island in the Bering Sea, a family of stranded woolly mammoths clung on, oblivious to their species' extinction everywhere else.
 
Dale Guthrie, an Arctic biologist at the University of Alaska in Fairbanks, reports in Nature today that although mammoths vanished from Siberia and the American Arctic before the end of the ice age, they survived on St Paul Island in the Bering Straits as late as 7,900 years ago. Wiped out everywhere else by climate change and stone-age hunters, the mammoths became stranded on the island as sea levels began to rise 13,000 years ago. A similar group of mammoths is known to have survived for at least as long on Wrangel Island off the north coast of Siberia.
 
Dr Guthrie used radiocarbon evidence to date a fossil fragment of a mammoth tooth. The puzzle is: if humans had hunted the great beasts to extinction elsewhere, how did some mammoth clans cling on.
 
"Why did they not find and kill off mammoths on St Paul?" he writes. "Mammoths on that earlier island complex at 13,000 years before the present would have been easily visible in a treeless landscape, when St Paul was separated from the mainland by a narrow channel, in the most likely path of coastal watercraft colonists."
 
 
Guardian Unlimited © Guardian Newspapers Limited 2004
 
 
http://www.guardian.co.uk/international/story/0,3604,1240442,00.html


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