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The age of most ancient geological formations is estimated by which method?

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The age of most ancient geological formations is estimated by which method?
posted May 9, 2016 by Kapil Kapoor

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What is a geological description of the land under Belize, Guatemala, El Salvador, Honduras, Nicaragua, Costa Rica and Panama?

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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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