What is a disadvantage of radiometric dating using potassium 40

For dating back to about 35,000 years, sediment layers are precise. Sediments include different types of pollen depending upon the season.

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For example, potassium decays into two different isotopes of argon having different half-lives.In fact, they track because radiometric data is accurate.An expert scientist summarizes: "The first radiometric dates, generated about 1920, showed that the Earth was hundreds of millions, or billions, of years old.Anyone questioning the accuracy of radiometric methods is obliged to explain why the cross-checks to sediments, coral growth, tree rings, and other isotope pairs all have the same errors.Why would an error in radiometric dating correspond to errors in the other methods so that they all track?

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