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Hadean aeon

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{n: Hadean, Hadean time, Hadean eon, Hadean aeon, Priscoan, Priscoan eon, Priscoan aeon} 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



{n: Precambrian, Precambrian eon, Precambrian aeon, 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


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