archaeozoic

Definition of archaeozoic

a.1.(Zool.) Like or belonging to the earliest forms of animal life.
2.(Geol.) formed in or belonging to the earlier of two divisions of the Precambrian era.
n.1.the time from 1.5 billion to 5 billion years ago; the time when the earth's crust formed; a time when only unicellular organisms and the earliest forms of life are present.

Related Words

archeozoic, early, geology
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