Proterozoic eon


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Related to Proterozoic eon: Hadean eon, Archean eon, Paleozoic era, Phanerozoic eon

Proterozoic eon

The second eon in Earth's history: 2.5 billion to 590 million years ago.
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Noun1.Proterozoic eon - from 2,500 to 544 million years agoProterozoic eon - from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
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 ?
The project, part of the International Continental Scientific Drilling Program, drilled a series of shallow, two-inch diameter cores and, by overlapping them, created a record representing stone deposited during the Proterozoic Eon (2,500 million to 542 million years ago).
The Proterozoic Eon saw two major events of oxygen build-up in the atmosphere and the oceans," El Albani explained.