Precambrian aeon

Definitions of Precambrian aeon
  1. noun
    the vast span of geologic time before the Phanerozoic eon, from Earth's formation about 4.6 billion years ago to about 541 million years ago
    synonyms: Precambrian, Precambrian eon, Precambrian period
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    example of:
    aeon, eon
    the longest division of geological time
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