The time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life. Synonyms: Archaeozoic, Archaeozoic aeon, Archean aeon, Archean eon, Archeozoic, Archeozoic eon.
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Words linked to "Archean" : geology, Precambrian aeon, Precambrian, eon, Precambrian eon, early, Precambrian period, aeon |
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