time scale geology

Jun 28th, 2015
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Erathem or Era : Cenozoic - 65.5 million years ago to Present "Age of Recent Life" . An era of geologic time from the beginning of the Tertiary period to the present. Its name is from Greek and means "new life."

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EonErathem or EraSystem,Subsystem or Period,Subperiod Series or Epoch P h a n e r o z o i c Cenozoic 65.5 million years ago to Present "Age of Recent Life" An era of geologic time from the beginning of the Tertiary period to the present. Its name is from Greek and means "new life." The Cenozoic, Mesozoic, and Paleozoic Eras are part of the Phanerozoic Eon Quaternary 1.8 million years ago to the Present The second period of the Cenozoic era. It contains two epochs: the Pleistocene and the Holocene. It is named after the Latin word "quatern" (four at a time). The several geologic eras were originally named Primary, Secondary, Tertiary, and Quaternary. The first two names are no longer used. Tertiary and Quaternary have been retained but used as period designations. Holocene 11,477 years ago (+/- 85 years) to the Present An epoch of the Quaternary period. It is named after the Greek words "holos" (entire) and "ceno" (new). Pleistocene 1.8 million to approximately 11,477 (+/- 85 years) years ago "The Great Ice Age" An epoch of the Quaternary period. It is named after the Greek words "pleistos" (most) and "ceno" (new). Tertiary 65.5 to 1.8 million years ago The first period of the Cenozoic era (after the Mesozoic era and before the Quaternary period). Pliocene 5.3 to 1.8 million years ago Final epoch of the Tertiary period. It is named after the Greek words "pleion" (more) and "ceno" (new). Miocene 23.0 to 5.3 million years

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