| 11. | The ground is mostly composed of Tertiary period rocks known for producing high-quality clay.
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| 12. | During the ensuing Tertiary period of the Cenozoic era, sea levels also varied substantially.
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| 13. | Luray Caverns does not date beyond the Tertiary period.
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| 14. | The Leipzig Bay was formed during the Tertiary period.
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| 15. | During most of the Tertiary period of the Cenozoic southern Alabama was covered by the sea.
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| 16. | Instead, the most marked erosion took place during the Tertiary period, entirely under a tropical climate.
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| 17. | The survivors speciated rapidly during the Tertiary period.
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| 18. | The ensuing Tertiary period of the Cenozoic era is also missing from the local rock record.
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| 19. | In 1828, Charles Lyell incorporated a Tertiary Period into his own, far more detailed system of classification.
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| 20. | This gap in the rock record continues into the Cenozoic era and spans the entire Tertiary period.
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