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 ?
billion years ago during the Archean eon (the oldest time from which rocks still exist) and, with one exception, has not erupted since.
According to astrobiologists, these meteor strikes can be dated to the Hadean and Archean eons - the first of the four principal eons in the earliest history of Earth.
The scientists led by a University of South Florida astrobiologist found that during the Hadean and Archean eons - the first of the four principal eons of the Earth's earliest history - the heavy bombardment of meteorites provided reactive phosphorus that when released in water could be incorporated into prebiotic molecules.