| 31. | Storks were distinct and possibly widespread by the Oligocene.
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| 32. | The source of uranium is thought to be the Oligocene Wall Mountain Tuff.
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| 33. | It includes two species distributed in Oligocene and Miocene deposits of western Siberia.
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| 34. | One fossil found is dated ( Early Oligocene ).
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| 35. | This is also late Oligocene in age and represents a basinal depositional environment.
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| 36. | It lived from 28 to 23 million years ago, during the Oligocene.
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| 37. | It was formed in the Eocene and Oligocene epochs of the Paleogene Period.
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| 38. | They disappeared at the end of the Oligocene, leaving no survivors today.
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| 39. | The spring emerges from Oligocene age limestone and discharges hard, sulphur water.
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| 40. | Rhinoceroses remained and were a prominent member of Oligocene Nebraska's fauna.
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