| 11. | :We can only base possible geologic time ranges on the earliest fossils known.
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| 12. | The interval of geologic time not represented is called a " hiatus ".
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| 13. | Most of his research has been biogeographical, on spatial diversification over geologic time.
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| 14. | Any older than that and you'd have to use the geologic time scale.
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| 15. | Measurements from the literature and the geologic time span involved would indicate otherwise.
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| 16. | The formations become narrower due to erosion over geologic time scales.
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| 17. | Over geologic time sea level has fluctuated by hundreds of meters.
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| 18. | In geologic time much of the surface rock has been eroded by glaciation.
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| 19. | The geologic time scale encompasses the history of the Earth.
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| 20. | The atmosphere of Venus is known to have undergone substantial evolution over geologic time.
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