12 Geologic Time

12 Geologic Time - Geologic Time"there is no vestige of a...

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Geologic Time “there is no vestige of a beginning, no prospect of an end” -James Hutton
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The Earth is 6011 years old. In 1654 James Ussher calculated the age of the earth using ‘begats’. 2007 + 4004 = …
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Clues to the actual age of the earth Powell’s Grand Canyon Expedition, 1869. Layers and layers of rock, cut into with excruciating slowness by the Colorado River.
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Geologic Time Scales
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Clues to the past lie in the present The Principle of Uniformitarianism, James Hutton, 1785. The processes at work today are the same processes at work in the past.
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The Present is the Key to the Past
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Which sedimentary rock is oldest? The Principal of Superposition Younger layered sedimentary rocks form on top of older rocks.
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They were originally deposited in horizontal layers. The Principle of Original Horizontality Are these rocks tilted or were they deposited like this?
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The Principle of Lateral Continuity (Original Continuity) Sedimentary layers don’t just end…
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Things happen in a logical order The Principle of Cross-cutting relationships
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younger. The Principle of Inclusions
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12 Geologic Time - Geologic Time"there is no vestige of a...

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