| 11. | Prior to one billion years ago, the geologic history of West Virginia is obscure.
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| 12. | As a result of its geologic history, Belledonne alternates jagged peaks with gentle slopes.
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| 13. | Little is known of the geologic history of this volcano.
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| 14. | The flakiness is interesting just for the geologic history issue,
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| 15. | The state's geologic history can be divided into three periods.
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| 16. | This one was the second most devastating in geologic history.
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| 17. | The flood is believed to be the second largest flood in known geologic history.
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| 18. | From that time the waters underwent a geologic history summarized under the names listed below.
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| 19. | The exhibits highlight the geologic history of Mount Mazama and the formation of Crater Lake.
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| 20. | These rock layers record much of the early geologic history of the North American continent.
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