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Geologic Time

Geologic Time. Using the rock record to age date rock layers. Age Dating. Geoscientists have devised a set of laws to help us understand (the “It’s so obvious” Laws). Age Dating. Uniformitarianism - Earth’s processes have remained the same over time (rock cycle, water cycle, climate, etc.)

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Geologic Time

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  1. Geologic Time Using the rock record to age date rock layers

  2. Age Dating • Geoscientists have devised a set of laws to help us understand (the “It’s so obvious” Laws)

  3. Age Dating • Uniformitarianism- Earth’s processes have remained the same over time • (rock cycle, water cycle, climate, etc.) • If you know how a rock formed 1 million years ago… • then you know how the same type of rock formed 3 billion years ago

  4. Age Dating • Stratification • rocks form in layers or strata • By looking at the surrounding layers, geoscientists can infer the relative age of a rock layer.

  5. Relative Age Dating • Law of Superposition • oldest rocks on the bottom

  6. Age Dating • Law of Original Horizontality • layers originally deposited horizontally • If they are folded or tilted… • Then they have been disturbed

  7. Age Dating • Law of Cross-cutting Relationships • rock/faults that cut through rock layers must be younger than the layers

  8. Age Dating • Principle of Fossil Succession • fossils succeed each other in a definite order

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