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Radiometric dating such as carbon 14, Uranium 238, 235, and 234, Thorium 232, Rubidium 87, and Potassium 40. This is not an exhaustive list. Each of these different isotopes have a different half life, so they can be used to measure different ages, from million to billions of years.
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Geologists determine the absolute age of rocks using radiometric dating . Radiometric dating includes finding the absolute age of a sample by determining the relative percentages of a radioactive parent isotope and stable daughter isotope.Igneous rocks are the best rocks for this purpose.

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