Maximum effective dating range for carbon 14 dating

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When rocks are heated to the melting point, any Ar-40 contained in them is released into the atmosphere.When the rock recrystallizes it becomes impermeable to gasses again.No, I'll take scientific observations any day of the week, it's just that so much of science must, as a discipline, base their observations on the painstaking recording of observable physical data.

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Carbon-14 has a half-life of 5,730 years so decays fairly quickly to unusable proportions.

It seems limited, how can an observer know the state of the decay of a certain molecular structure even 100,000 calendar years ago?

Could there be other influences that would affect the rate of decay of carbon 14?

Click on the "Show Movie" button below to view this animation.

K-Ar Decay Profile Clicking on the "Show Movie" button below will bring up an animation that illustrates how a K-Ar sample is processed and the calculations involved in arriving at a date.

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