| 21. | The valley formation is dated to the Late Pliocene and early Pleistocene uplift unconformity.
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| 22. | The upper boundary of the group is an unconformity with the overlying Windermere Supergroup.
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| 23. | Barnett Shale was deposited over the resulting unconformity.
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| 24. | There is an unconformity at the Pliocene base.
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| 25. | The absence of rocks is called an unconformity.
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| 26. | The Inalti was deposited during the upper Jurassic and is truncated by an unconformity.
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| 27. | The Great Unconformity has an irregular hilly surface.
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| 28. | The rocks above an unconformity time during which no sediments were preserved in a region.
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| 29. | The length of time represented by Powell's Great Unconformity varies along its length.
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| 30. | A prominent exposure of Powell's Great Unconformity occurs in Frenchman Mountain in Nevada.
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