Precambrian
adjective
1.
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.
noun
2.
the Precambrian Era.
adjective
1.
of, denoting, or formed in the earliest geological era, which lasted for about 4 000 000 000 years before the Cambrian period
noun
2.
the Precambrian, the Precambrian era See Archaeozoic, Proterozoic
Precambrian
(prē-kām’brē-ən, -kām’-)
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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