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What is the first geological period of the Paleozoic era?

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What is the first geological period of the Paleozoic era?
posted Sep 6, 2016 by Nikita Sehgal

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The Paleozoic Periods: Cambrian Ordovician Silurian Devonian Carboniferous Permian. The Paleozoic (meaning "time of ancient life)" Era lasted from 544 to 245 million years ago, and is divided into six periods.

answer Sep 10, 2016 by Shivaranjini
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Hint:

  1. Paleozoic Era = 543 million years ago (starting with the Cambrian period - shellfish, trilobites)
  2. Mesozoic Era = 248 million years ago (starting with the Triassic period - dinosaurs, mammals)
  3. _______ Era = 65 million years ago (starting with the Tertiary period - mass extinction)
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