Archean eon

Definitions of Archean eon
  1. noun
    the second eon of geologic time, from about 4.0 to 2.5 billion years ago
    synonyms: Archaeozoic, Archaeozoic aeon, Archean, Archean aeon, Archeozoic, Archeozoic eon
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    example of:
    aeon, eon
    the longest division of geological time
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