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Phanerozoic

Phan·er·o·zo·ic [ fànnərə zṓ ik ]


noun 
Definition:
 
Phanerozoic eon: the present eon of geologic time, beginning 570 million years ago, that consists of the Paleozoic, Mesozoic, and Cenozoic eras

[Late 19th century. < Greek phaneros "visible" + zōē "life"]

Phan·er·o·zo·ic adjective
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