| oligocene | <geology> Of, pertaining to, or designating, certain strata which occupy an intermediate position between the Eocene and Miocene periods. The Oligocene period. Origin: Oligo- + Gr. New, recent. Source: Websters Dictionary (01 Mar 1998) |
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| oligocene | from 25 million to 40 million years ago |
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| oligocene | from 25 million to 40 million years ago |
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