| 41. | Oligocene clastic rocks can also act as reservoir rocks in distal fan facies.
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| 42. | Some Oligocene-Miocene layers are exposed in the Quebrada de las Zorritas.
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| 43. | The first true tapirs appeared in the Oligocene.
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| 44. | Zavortink & Poinar contained in German amber from the Late Oligocene ( to ).
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| 45. | Volcanism occurred as late as Oligocene time, but continues sporadically up to present.
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| 46. | Paleomagnetic dating puts the sites at 33 Ma, consistent with the Oligocene epoch.
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| 47. | During the Oligocene, Africa was not connected to any of the other continents.
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| 48. | Protoceras lived in the deserts of the Late Oligocene, alongside the oreodont Leptauchenia.
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| 49. | This species was long believed to have first been found in Early Oligocene deposits.
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| 50. | It lived from the Oligocene to the Pliocene.
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