12/31/2004

Prehistoric Asteroid "Killed Everything"

Scientists have found traces of an asteroid-collision event that they say would have created a giant tsunami that swept around the Earth several times, inundating everything except the mountains. The coastline of the continents was changed drastically and almost all life on land was exterminated.



This cataclysm some 3.5 billion years ago is the earliest known meteor strike to hit the Earth, and one of at least four that have been identified in a geologically brief 300-million-year period. The strike is the subject of an article published in the current issue of the journal Science by Louisiana State University geologist Gary Byerly and others.



Prehistoric Asteroid "Killed Everything"

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