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.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
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
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The discovery could explain why, for two billion years during the Proterozoic Eon, life was prevented from colonising land.
For years, scientists have known the earliest microbes came to be billions of years ago, while multicellular organisms didn't appear on the geologic time scales until the end of Proterozoic Eon - the time from 2.5 billion years ago to 541 million years ago.