archean eon

Noun
  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 (synset 115154172)
    is an instance of: aeon, eon - the longest division of geological time
    is a part of: precambrian, precambrian aeon, precambrian eon, precambrian period - the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
    same as: archaeozoic, archaeozoic aeon, archean, archean aeon, archeozoic, archeozoic eon

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