From The Observer in Britain:
Diamonds tell tale of comet that killed off the cavemen
Robin McKie, science editor
Sunday May 20, 2007
Scientists will outline dramatic evidence this week that suggests a comet exploded over the Earth nearly 13,000 years ago, creating a hail of fireballs that set fire to most of the northern hemisphere.
The blast also caused a major bout of climatic cooling that lasted 1,000 years and seriously disrupted the development of the early human civilisations that were emerging in Europe and Asia.
‘This comet set off a shock wave that changed Earth profoundly,’ said Arizona geophysicist Allen West.
‘It was about 2km-3km in diameter and broke up just before impact, setting off a series of explosions, each the equivalent of an atomic bomb blast.
The result would have been hell on Earth. Most of the northern hemisphere would have been left on fire.’
The theory is to be outlined at the American Geophysical Union meeting in Acapulco, Mexico.
A group of US scientists that include West will report that they have found a layer of microscopic diamonds at 26 different sites in Europe, Canada and America.
These are the remains of a giant carbon-rich comet that crashed in pieces on our planet 12,900 years ago, they say. …
These are the sudden disappearance of the first Stone Age people of America, the disappearance of mammoths throughout much of Europe and America and the sudden cooling of the planet, an event known as the Younger-Dryas period.
Various theories have been put forward to explain these occurrences, but now scientists believe they have found a common cause in a comet crash.
However, the idea is still controversial and the theory is bedevilled by problems in obtaining accurate dates for the different events.
See also here.
Comet Killed Ice Age Beasts: here.
A controversial theory that suggests an extraterrestrial body crashing to Earth almost 13,000 years ago caused the extinction of many large animals and a probable population decline in early humans is gaining traction from research sites around the world: here.
A critical view on this comet impact theory: here.
Prehistoric figurines of mammoths: here.
Baby mammoth found in Russia: here.