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Noun: Archaeozoic aeon
  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, Archaean

Type of: aeon, eon

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

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Archaeopteryx lithographica
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Archaeozoic aeon
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