Before radiometric dating

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The dates must be inferred based on assumptions about the ratios.

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It's this resetting process that gives us the ability to date rocks that formed at different times in earth history.Determining the relative age of a rock layer is based on the assumption that you know the ages of the rocks surrounding it.Uniformitarian geologists use so-called dating methods to determine the ages of the surrounding rocks.A commonly used radiometric dating technique relies on the breakdown of potassium (Ar in an igneous rock can tell us the amount of time that has passed since the rock crystallized.If an igneous or other rock is metamorphosed, its radiometric clock is reset, and potassium-argon measurements can be used to tell the number of years that has passed since metamorphism.

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