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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

But how may we separate the Proterozoic rocks from the Archeozoic?
Geology William J. Miller

Archeozoic , the era in which the simplest forms of life originated.
Unexplored! Allen Chaffee

Even in the Archeozoic the rocks testify to a climate seemingly not greatly different from that of the average of geologic time.
Climatic Changes Ellsworth Huntington

Archeozoic rocks have been studied minutely over a very small percentage of the earth’s land surface.
Climatic Changes Ellsworth Huntington

It has been estimated that Archeozoic rocks appear at the surface over about one-fifth of the land area of the earth.
Geology William J. Miller

Thus, igneous rocks distinctly predominate in the Archeozoic, while stratified rocks predominate in the Proterozoic.
Geology William J. Miller

I believe that our sun could not have been a typical nova, at least not since the Archeozoic, that is for perhaps a billion years.
Climatic Changes Ellsworth Huntington

Do the most ancient known rocks show that animal life existed during Archeozoic time?
Geology William J. Miller

During the Archeozoic, no evidence of glaciation has yet been discovered.
Climatic Changes Ellsworth Huntington

The early and middle Proterozoic strata throw no more light upon the early history of animal life than do the Archeozoic strata.
Geology William J. Miller

adjective
a variant spelling (esp US) of Archaeozoic
Archeozoic also Archaeozoic
(är’kē-ə-zō’ĭk)
See Archean.