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

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Presentation on theme: "Geologic Time Using the rock record to age date rock layers."— Presentation transcript:

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 Its so obvious Laws)

3 Age Dating Uniformitarianism- Earths 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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