Archean eon

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Related to Archean eon: Proterozoic eon, Phanerozoic eon

Archean eon:

see PrecambrianPrecambrian,
name of a major division of geologic time (see Geologic Timescale, table), from c.5 billion to 570 million years ago. It is now usually divided into the Archean and Proterozoic eons. Precambrian time includes 80% of the earth's history.
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References in periodicals archive ?
It wasn't a blue planet by any means." By the end of the Archean Eon some 2.5 billion year ago, oxygen levels rose quickly, creating an explosion of new life on the planet, he said.
The mantle was so hot from its birth and up until about 2.5 billion years ago - during what is known as the Archean Eon - because elements like potassium and uranium were decaying and releasing radioactive heat, according to ( Virginia Tech .
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 2.8 billion years ago were reasonable atmospheric carbon dioxide amounts believed to be present at the time and perhaps a dash of methane.
Previously scientists have explained the presence of liquid water in that lowlight time, during the Archean Eon (about 3.8 billion to 2.5 billion years ago), by suggesting that Earth's atmosphere held large amounts of planet-warming greenhouse gases such as carbon dioxide and methane.