Third and final division of the Paleogene Period of the Cenozoic Era, spanning an interval from about 34 million to 23 million years ago. Like the Eocene Epoch, which preceded it, and the Miocene, which followed, the Oligocene (Greek, “little life”) was originally defined by the percentage of modern species of shellfish (10-15 percent) found in strata of this age.
The Oligocene epoch is a geologic period that extends from about 33.9 million to 23 million years before the present. As with other older geologic periods, the rock beds that ...
The Oligocene epoch is part of the Tertiary Period in the Cenozoic Era, and lasted from about 33.7 to 23.8 million years ago (mya). The Oligocene is thus a relatively short span ...
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