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Noun: Precambrian eon
  1. The eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
    - Precambrian, Precambrian aeon, Precambrian period

Type of: aeon, eon

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Precambrian
Precambrian aeon
Precambrian eon
Precambrian period
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precautional