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1. Of or relating to the earliest known rocks formed during the Precambrian Eon
   - archean [US]

1. 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 [US], Archean eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon

See also: early

Type of: aeon, eon

Part of: Precambrian, Precambrian aeon, Precambrian eon, Precambrian period

Encyclopedia: Archaean