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The Potassium-Argon dating method is the measurement of the accumulation of Argon in a mineral.It is based on the occurrence of a small fixed amount of the radioisotope Ar with a half-life of about 1,300 million years.When Rutherford announced his findings it soon became clear that Earth is millions of years old.

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It is best used with rocks that contain minerals that crystallised over a very short period, possibly at the same time the rock was formed.Quaternary geology provides a record of climate change and geologically recent changes in environment.

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