Geologic Principles and Dating Rock Layers

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    Daniel J. So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil. Afterwards, they decay at a predictable rate. Because it is unstable, occasionally C14 dating Rock layer radioactive decay to become stable nitrogen N The same geologic process, erosion, that has created the Grand Canyon over the past 40 million years, is still in effect today, evidenced by the Big Darby Creek. Geologists draw on it and other basic principles http: So to date those, geologists look for layers like volcanic ash that might be sandwiched between the sedimentary layers, and that tend to have radioactive elements. Each time a new layer of sediment is deposited dating Rock layer is laid down dating Rock layer on top of an older layer. Contains feldspar crystals.

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