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{%type%} Definitions

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n. - From 40 million to 25 million years ago.

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Usage examples (37)
  • This differs chiefly from Lyell's classification in the introduction of the term Oligocene for the upper part of the original Eocene, which was somewhat unwieldy.
  • These are Oligocene formations of gypsum and saline.
  • He has been dated to the Oligocene, 15 million years ago.
  • Even the ants and bees have made no advance since the Oligocene.
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