archaeozoic

• 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)
  instance hypernym: aeon, eon - the longest division of geological time
  part meronym: 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
  synonym: archaeozoic aeon, archean, archean aeon, archean eon, archeozoic, archeozoic eon

• Of or belonging to earlier of two divisions of the Precambrian era (synset 300817820)
  domain category: geology - a science that deals with the history of the earth as recorded in rocks
  similar: early - at or near the beginning of a period of time or course of events or before the usual or expected time
  synonym: archeozoic

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