Proterozoic 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
Proterozoic, Proterozoic aeon
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
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