| 21. | "The moon is a geologic time machine, " he says.
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| 22. | You're trying to predict geologic processes over geologic time lines.
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| 23. | According to Geologic time scale, they arose in the late Carboniferous, before the Permian.
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| 24. | The Shasta Valley is dominated by nearby Mount Shasta and underlain with geologic time.
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| 25. | Geologic time is not the measure of a process that has come to an end.
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| 26. | Leaving the pass, we gained speed until we seemed to be moving through geologic time.
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| 27. | At this geologic time scale, language tends to change.
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| 28. | See New islands and Sea level # Changes through geologic time for a few details.
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| 29. | By using stratigraphic principles, absolute ages in geologic time.
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| 30. | Polarity reversals in the Earth's magnetic field have also been used to determine geologic time.
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