Monday, January 05, 2009

Did Air Burst Asteroid Do For North American Mammoths?

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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