Priscoan eon

Definitions of Priscoan eon
  1. noun
    the first eon of geologic time, beginning with the formation of Earth approximately 4.6 billion years ago and ending about 4.0 billion years ago
    synonyms: Hadean, Hadean aeon, Hadean eon, Hadean time, Priscoan, Priscoan aeon
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    example of:
    aeon, eon
    the longest division of geological time
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