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How is geologic time recorded in rock layers?

April 26, 2017geologic layers recorded rock time

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How is geologic time recorded in rock layers?

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The strata of sedimentary rock can contain fossils which are peculiar to a specific geologic time. These fossils are referred to as index fossils. Some rock layers also record events such as meteor strikes and periods of volcanism through the deposition of sediments. Igneous rocks in particular contain certain mineral crystals which can be used to provide a radiometric fingerprint of their period of formation.