eon : Idioms & Phrases


archean eon

  • noun the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
    Archean aeon; Archean eon; Archaeozoic aeon; Archaeozoic; Archean; Archeozoic.
WordNet

archeozoic eon

  • noun the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
    Archean aeon; Archean eon; Archaeozoic aeon; Archaeozoic; Archean; Archeozoic.
WordNet

hadean eon

  • noun the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life
    Priscoan; Hadean aeon; Hadean; Hadean time; Hadean eon; Priscoan aeon.
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phanerozoic eon

  • noun the period from about 5,400 million years ago until the present
    Phanerozoic; Phanerozoic aeon.
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precambrian eon

  • noun the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
    Precambrian period; Precambrian aeon; Precambrian.
WordNet

priscoan eon

  • noun the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life
    Priscoan; Hadean aeon; Hadean; Hadean time; Hadean eon; Priscoan aeon.
WordNet

proterozoic eon

  • noun from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
    Proterozoic aeon; Proterozoic.
WordNet