| 21. | Uplift started in the Oligocene and lasted till the Pleistocene.
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| 22. | Camels were a new arrival to Nebraska during the Oligocene.
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| 23. | Fossil Prionomyrmecini ants existed in Europe during the Eocene and Late Oligocene.
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| 24. | Ore deposits occurred mainly along major mineralization occurred in the Late Oligocene.
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| 25. | Sag phase deposition begins in the upper Eocene to Oligocene.
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| 26. | In the region, mafic volcanism has been active since the Oligocene.
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| 27. | The first cats emerged during the Oligocene, about 25 million years ago.
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| 28. | Perissodactyls were the dominant group of large terrestrial browsers right through the Oligocene.
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| 29. | There are two phases of extension observed : late Oligocene and middle Miocene.
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| 30. | In the Oligocene, they are found in these three regions plus Africa.
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