What is k ar dating
The potassium-argon (K-Ar) isotopic dating method is especially useful for determining the age of lavas.Developed in the 1950s, it was important in developing the theory of plate tectonics and in calibrating the geologic time scale.The site also must be geologically meaningful, clearly related to fossil-bearing rocks or other features that need a good date to join the big story.Lava flows that lie above and below rock beds with ancient human fossils are a good—and true—example.The severity of this problem decreases as the accuracy of our instruments increases.
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However, this only works if all the excess argon did indeed come from the atmosphere.That is, a fresh mineral grain has its K-Ar "clock" set at zero.
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