Precambrian or Pre-Cam·bri·an [pree- kam-bree- uh n, - keym-] Geology EXAMPLES | WORD ORIGIN adjective noting or pertaining to the earliest era of earth history, ending 570 million years ago, during which the earth's crust formed and life first appeared in the seas. Origin of Precambrian
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for precambrian Historical Examples of precambrian British Dictionary definitions for precambrian adjective of, denoting, or formed in the earliest geological era, which lasted for about 4 000 000 000 years before the Cambrian period
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Word Origin and History for precambrian
Online Etymology Dictionary, © 2010 Douglas Harper
The period of geologic time between Hadean Time and the Phanerozoic Eon, from about 3.8 billion to 540 million years ago. During the Precambrian Eon, which is divided into the Archean and Proterozoic, primitive forms of life first appeared on Earth. See Chart at geologic time.
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