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The “age of visible life”—the fossil-rich past 590 million years of Earth's history.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
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|Noun||1.||Phanerozoic eon - the period from about 5,400 million years ago until the present|
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.