How is radiometric dating used

Fossils are generally found in sedimentary rock — not igneous rock.

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So in order to date most older fossils, scientists look for layers of igneous rock or volcanic ash above and below the fossil.

Scientists date igneous rock using elements that are slow to decay, such as uranium and potassium.

Continue Reading Relative dating observes the placement of fossils and rock in layers known as strata.

Basically, fossils and rock found in lower strata are older than those found in higher strata because lower objects must have been deposited first, while higher objects were deposited last.

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