eon : Idioms & Phrases
Index
archean eon
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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
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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
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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
phanerozoic eon
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noun the period from about 5,400 million years ago until the present
Phanerozoic; Phanerozoic aeon.
WordNet
precambrian eon
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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
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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
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noun from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
Proterozoic aeon; Proterozoic.