| 11. | It is believed to have gone extinct in the Late Pliocene.
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| 12. | It is thought to have been from the late Pliocene period.
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| 13. | Its southern end is the ancient Kissimmee Embayment of the Pliocene.
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| 14. | This formation represents deposition during the Late Miocene and Early Pliocene.
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| 15. | Inversion continued in a punctuated fashion through the Miocene and Pliocene.
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| 16. | During the lower Pliocene, the system underwent uplift and erosion.
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| 17. | With the onset of the Pliocene, the global climate became cooler.
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| 18. | The split off 2.2 million years ago during the Pliocene.
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| 19. | The Ogallala Formation of Pliocene Age overlies the Pierre Shale.
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| 20. | The species first appeared during the middle Pliocene in Asia.
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