Priscoan eon

Definitions:

Noun

Hadean Hadean time Hadean eon Hadean aeon Priscoan Priscoan eon Priscoan aeon

Definition: 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

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