Archean eon


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Related to Archean eon: Proterozoic eon, Phanerozoic eon

Archean eon

The first eon in Earth’s history (4.6–2.5 billion years ago).
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Noun1.Archean eon - the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
Precambrian, Precambrian aeon, Precambrian eon, 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
References in periodicals archive ?
Evidence of the paradox comes from clues in the rock record that indicate the presence of flowing water as far back as the Archean eon, 3.
The new 3-D model of the Archean Eon on Earth that lasted from about 3.
Two researchers from University of Colorado Boulder say all that may have been required to sustain liquid water and primitive life on Earth during the Archean eon 2.