The Law of Superposition and Index Fossils

The video explains Earth's dynamic geologic history and the methods scientists use to study it. The law of superposition helps determine the relative ages of sedimentary rock layers, with younger layers on top of older ones. Geologists use this law to sequence events in a specific area. To compare distant areas, index fossils are used. These fossils, from organisms that lived during a short time span, help correlate rock layers across distances, indicating they are of similar age.

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