priscoan in English
adjective
1
of, relating to, or denoting the eon that (in some schemes) constitutes the earliest part of the Precambrian, preceding the Archean eon. It extended from the origin of the earth to about 4 billion years ago and has left no so far identifiable rocks.
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1. In chronological arrangements which include the Priscoan eon, the Archean began about 4,000 million years ago