Index fossil are useful because they tell the relative ages of the rock layers in which they occur. 1. Law of Superposition- In undisturbed horizontal sedimentary rock layers, the oldest layer is at the bottom. Each higher layer is younger than the layer below it.
2.The intrusions- will cut through rock layers, being the youngest layers. 3. Faults- will cause the rocks to break and shift along it. 4. Unconformities- is a gap in the geologic record, due that it has been lost because of erosion. |
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