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The Precambrian (or Pre-Cambrian) is the large span of time in Earth's history before the current Phanerozoic Eon, and is a Supereon divided into several eons of the geologic time scale. It spans ...
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The Phanerozoic (British English Phanærozoic) /?fæn?r?'zo??k/ is the current geologic eon in the geologic timescale, and the one during which abundant animal life has existed. It covers roughly 542 mi ...
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The Cenozoic Era is the current and most recent of the three Phanerozoic geological eras, following the Mesozoic Era and covering the period from 66 million years ago to the present. The era began in ...
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The Paleozoic (or Palaeozoic) Era (from the Greek palaios, "old" and zoe, "life", meaning "ancient life") is the earliest of three geologic eras of the Phanerozoic Eon, s ...
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