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In the geological time frame, there are 3 Eras: Paleozoic, Mesozoic, and the third one is?

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  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)
posted Nov 4, 2016 by George Davros

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