Using the rock record to age date rock layers

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Presentation transcript:

Using the rock record to age date rock layers 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.) 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

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.

Relative Age Dating Law of Superposition oldest rocks on the bottom

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

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

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