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Precambrian |
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Precambrian, Pre-Cambrian of, denoting, or formed in the earliest geological era, which lasted for about 4 000 000 000 years before the Cambrian period Precambrian [prē′kam·brē·ən] (geology) All geologic time prior to the beginning of the Paleozoic era (before 600,000,000 years ago); equivalent to about 90% of all geologic time. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Finally, as a microbe in the Precambrian period, he learns that to kill and devour others is good--it's called heterotrophic life. Knoll of Harvard University says that Brasier and his colleagues, who report their discovery in the April Geology, have clearly documented the existence of sponges in the latest stage of the Precambrian period. At present, reliable paleomagnetic evidence from the Precambrian period is scant, leaving geologists free to propose almost any conceivable orientation for the continents during that period. |
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