| 11. | This sea gradually retreated from the state before the end of the Paleozoic era.
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| 12. | The rocks in the watershed date to the Precambrian Era and Lower Paleozoic Era.
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| 13. | Orthocerids flourished in the Paleozoic Era, giving rise to such intriguing forms as the coleoids.
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| 14. | The municipality of Badajoz contains soils derived from tertiary deposits, dating to the Paleozoic era.
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| 15. | The first period of activity occurred during the Paleozoic era, with two periods of change.
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| 16. | Sauropsids evolved from basal amniotes stock approximately 320 million years ago in the Paleozoic Era.
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| 17. | It is composed of rocks from the Paleozoic era ( 250-500 million years old ).
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| 18. | Much of New York was covered in seawater during the early part of the Paleozoic era.
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| 19. | The Western Carpathians have a complicated geological structure, that has been formed since the Paleozoic era.
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| 20. | However, the swamps bearing these plants would dry up before the end of the Paleozoic era.
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