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| Eocene |
of, relating to, or designating the geological epoch between the Paleocene and Oligocene of the Tertiary Period, from approximately 54 million to 38 million years ago, when modern mammals became dominant. [1/2 definitions] |
| Miocene |
of, relating to, or designating the geological epoch between the Oligocene and Pliocene of the Tertiary Period, from approximately 26 million to 5 million years ago, when mammals began to acquire modern characteristics. [1/2 definitions] |
| Oligocene |
the Oligocene Epoch, or the rock formations that date from that time. [1/2 definitions] |
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