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Related to Priscoan: Priscoan eon, Priscoan period
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Noun1.Priscoan - 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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References in periodicals archive ?
Bowring, S.A., and Williams, I.A., 1999, Priscoan (4.00-4.03 Ga) Orthogneisses from Northwestern Canada: Contributions to Mineralogy and Petrology, v.