post cambrian

Science Dictionary
Cambrian   (kām'brē-ən, kām'-)  Pronunciation Key 
The first period of the Paleozoic Era, from about 540 to 505 million years ago. During this time warm seas and desert land areas were widespread, and animal life diversified rapidly during what is known as the Cambrian Explosion. See Chart at geologic time.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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