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Phanerozoic (adj.)

"of or pertaining to the whole of geological time since the beginning of the Cambrian," so called from the abundant evidence of life preserved in the rocks, 1930; see phanero- "visible, manifest" + zoic "pertaining to life."

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Definitions of Phanerozoic from WordNet

Phanerozoic (n.)
the period from about 540 million years ago until the present, a period when abundant life existed;
Synonyms: Phanerozoic eon / Phanerozoic aeon
From wordnet.princeton.edu