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Adjective: archean  aar'kee-un
Usage: US (elsewhere: archaean)
  1. (geology) of or relating to the earliest known rocks formed during the Precambrian Eon
    - archaean
Noun: Archean  aar'kee-un
Usage: US (elsewhere: Archaean)
  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 eon, Archean aeon, Archeozoic, Archaeozoic, Archeozoic eon, Archaeozoic aeon, Archaean

See also: early

Type of: aeon, eon

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

Encyclopedia: Archean