Small diamonds distributed by North America suggest a series of comets struck the Earth does about 13,000 years, causing a cold period in the planet that took to mamuts and other creatures to the extinction, according to the scientists.

The diamonds give faith of an event that would have surpassed to the Biblical stories, a series of explosions shining in the atmosphere equivalent to thousand of atomic bombs, said to the investigators Friday. The nanodiamantes calls are created in conditions of high temperatures and high pressure generated by impacts cosmic, similar to an explosion on Tunguska, in Siberia, that demolished trees in kilometers to the round one in 1908.

Doug Kennett of the University of Oregon and its colleagues found small diamonds in zones that go from Arizona to Carolina of the South and to Alberta and Manitoba in Canada. They are buried at a level that has been corresponding with a time for 12,900 years, in the beginning of the Recent Dryas - a cold period of about 1,300 years at the end of the Pleistocene during which mamuts, the teeth of saber, the camels and the sluggish giants of North America were extinguished.

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