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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.
the Archeozoic division of geologic time or the rock systems formed then.
Historical Examples

The remainder of Finland is built up of the oldest known crystalline rocks belonging to the Archaeozoic or Algonkian period.
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 Various

a former word for Archaean
a variant spelling (esp US) of Archaeozoic
Another spelling of Archeozoic.
Archeozoic also Archaeozoic
See Archean.


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  • Archaic homo sapiens

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