Noun
-
the time from 3,800 million years to 2,500 million years ago
earth's crust formed
unicellular organisms are earliest forms of life
- archean eon - archean aeon - archeozoic - archeozoic eon - archaeozoic aeon
Adjective
-
of or belonging to earlier of two divisions of the Precambrian era
"archeozoic life forms"
- archeozoic