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Ar•che•o•zo•ic



Pronunciation: (är"kē-u-zō'ik), [key] Geol.

adj.
noting or pertaining to the earlier half of the Precambrian Era, from about 5 billion to 2.5 billion years ago, during which the earliest datable rocks were formed and from which the oldest known fossil forms, blue-green algae and bacteria, have been recovered. See table under geologic time.

n.
the Archeozoic division of geologic time or the rock systems formed then. Also,Archaeozoic.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

archeometryArcheptolemus
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