17_Geologic_Time[1]

17_Geologic_Time[1] - 1 geologic time People think in five...

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Unformatted text preview: 1 geologic time People think in five generations two ahead, two behind with heavy concentration on the one in the middle The human mind may not middleThe human mind may not have evolved enough to comprehend deep time. -John McPhee, Basin and Range A Spiral of Deep Time 2 Starting a Mountain ocean sedimentary rocks (e.g., limestone) Mountain Building: Relative History From Simple Observation limestone 3 Principle of Original Horizontality tilted beds (tilting occurs after deposition) horizontal beds Principle of Superposition young Grand Canyon, Arizona old Principle of Superposition 4 Overturned Beds Complicate Interpretation truck for scale More Information is Required C Arrange oldest to youngest A B 5 Principle of Cross-cutting Relationships igneous intrusion fault Such as Sedimentary Features - Mudcracks or Ripple Marks mudcrack ripple mark up Sedimentation Rates 6 Sedimentation Rates Not Always Constant Glacial Lake Missoula 7 8...
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17_Geologic_Time[1] - 1 geologic time People think in five...

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