Friday, May 1, 2009

mass extinctions

Both land and sea dinosaurs died out at the same time, refereeing to, and a catastrophic collapse of life on earth; due to external forces that the earth’s atmosphere could not satisfy.

The generation of all mass extinctions marked the end o the Permian periods and the start of the Triassic period, 250 million year ago. Surveys of the fossil evidence suggest that living species disappear at the end of the Permian period. This great shock to life signified the beginning of a new era, the Mesozoic era, and a time when the dinosaur’s ruled the earth.


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Len Wilson

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