| 11. | South American hystricomorphs first appeared in the Lower Oligocene period.
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| 12. | In Oligocene / Miocene Florida, oreodonts are surprisingly rare.
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| 13. | It was found in Oligocene amber from the Dominican Republic.
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| 14. | The Mal�guide thrust sheet contains rocks from Silurian to Oligocene.
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| 15. | Fossil fruits of this species are known from the Oligocene of England.
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| 16. | This species is found from the Paleocene to the Oligocene of Europe.
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| 17. | In the late Eocene and early Oligocene lakes were formed near Waratah.
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| 18. | The Family lived from the Oligocene to the Pliocene before going extinct.
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| 19. | Oligocene to Quaternary basin sediments reach more than 280 m in thickness.
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| 20. | The Yucat�n Peninsula is a Cretaceous to Oligocene carbonate platform.
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