Monday, May 21, 2007

American Ice Age?

Scientists have found evidence across North America which suggests to them that there was some kind of cosmic explosion some 13,000 years ago which may have wiped-out the first Stone Age culture and caused the Laurentide Ice sheet, which covered thousands of square miles of North American land.

They feel the explosion may have occurred in the atmosphere or the ice sheet may have erased the crater. The evidence they do have will be revealed at a meeting in Mexico later this week, but includes the fact that layers of sediment in over 20 North American locations contain "exotic" materials, such as nanodiamonds, tiny spheres of glass and carbon, and levels of iridium too high to have come from Earth. This would have brought about the period known as the Younger Dryas.

This event is thought to have caused the extinction of the giant land mammals, such as the giant sloth and the woolly mammoth.

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