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Cambrian period

   Also found in: Encyclopedia, Wikipedia, Hutchinson 0.02 sec.
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Noun1.Cambrian period - from 544 million to about 500 million years ago; marine invertebrates
Cambrian
Paleozoic, Paleozoic era - from 544 million to about 230 million years ago


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The rocks bearing the fossils were deposited on an ocean bottom about 520 million years ago during the Cambrian period.
Remains may be an evolutionary relic by Science News
But for half a billion years, these cryptic organisms presumably were slowly evolving, diverging into different lineages and finally becoming big and complex enough to leave a profusion of fossils, beginning about 565 million years ago in the late Vendian geological period and extending into the Cambrian period.
ANIMAL LIFE ON EARTH MAY BE TWICE AS OLD by Daily News (Los Angeles, CA)
Evolution's Big Bang took place beginning 543 million years ago, in the Cambrian period.
In the Blink of an Eye by Science News
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