Monday, January 05, 2009

Did Air Burst Asteroid Do For North American Mammoths?

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Sounds reasonable.




The controversial idea that space impacts may have wiped out woolly mammoths and early human settlers in North America has received new impetus.

Nano-diamonds and other exotic impact materials have been unearthed in thin sediments, Science magazine reports.

The age of these materials coincides with the start of a millennium-long climate cooling event known as the Younger Dryas - some 13,000 years ago.

Many large animals vanish from the archaeological record at this time.

It is also the period in Earth history that sees the demise of Clovis culture - the prehistoric civilisation that many regard as the first human occupation of North America.

Taken together, it all makes for a compelling story, claims the team behind the latest research.more

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