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Analyzing specimens whose relative geologic ages were known, Boltwood found that the ratio of lead to uranium did indeed increase...

So we can't pick up an artifact that's made from volcanic rock and get a potassium argon date on the artifact.The fossil record may be incomplete and may never fully completed, but there are still many clues to evolution and how it happens within the fossil record.One way that helps scientists place fossils into the correct era on the Geologic Time Scale is by using radiometric dating.This lesson is the third in a three-part series about the nucleus, isotopes, and radioactive decay.The first lesson, Isotopes of Pennies, deals with isotopes and atomic mass.

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