1) Aeon 2) Phanerozoic aeon 3) Phanerozoic eon
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1) Eon
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https://www.crosswordclues.com/clue/phanerozoic
The Phanerozoic (British English Phanærozoic) k is the current geologic eon in the geologic timescale, and the one during which abundant animal life has existed. It covers roughly 542 million years ({Geologic Ages Inline|Phanerozoic}) and goes back to the time when diverse hard-shelled animals first appeared. Its name derives from the Ancient Gre...
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http://en.wikipedia.org/wiki/Phanerozoic
Geologic eon that occurs from 2500 million years ago to today. During this time period, life becomes more diversified and complex.
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http://www.physicalgeography.net/physgeoglos/p.html
n. The geologic eon that includes the interval of time from approximately 543 million years ago to the present, comprising the Paleozoic, Mesozoic, and Cenozoic eras.
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http://www.ucmp.berkeley.edu/glossary/gloss2geol.html
n. The geologic eon that includes the interval of time from approximately 543 million years ago to the present, comprising the Paleozoic, Mesozoic, and Cenozoic eras.
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http://www.ucmp.berkeley.edu/glossary/glossary_2.html
Phanerozoic eon noun the period from about 5,400 million years ago until the present
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https://www.encyclo.co.uk/local/20974
The period of time, also known as an eon, between the end of the Precambrian and today, The Phanerozoic begins with the start of the Cambrian period, 544 million years ago. It encompasses the period of abundant, complex life on the Earth.
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the most recent eon of geologic time beginning 570 million years ago and continuing to the present.
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https://www.encyclo.co.uk/local/22327
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