The measurement of the decay of radioactive isotopes, especially uranium, strontium, rubidium, argon and carbon, has allowed geologists to more precisely determine the age of rock formations.

对放射性同位素衰变的测量，尤其是铀、锶、铷、氩和碳，可允许地质学家更精确地确定岩层的年龄。

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Potassium-argon dating: Method for determining the age of igneous rocks based on the amount of argon-40 in the rock.

钾-氩年代测定法：根据岩石内氩-40的含量来测定火成岩形成年代的方法。

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Potassium-argon dating: Method for determining the age of igneous rocks based on the amount of argon-40 in the rock.

钾-氩年代测定法：根据岩石内氩-40的含量来测定火成岩形成年代的方法。

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