However, some Christians suggest that the geologic dating techniques are unreliable, that they are wrongly interpreted, or that they are confusing at best. Nevertheless, terrestrial cosmic-ray exposure dating has been shown to be useful in many cases. And yet, with a large amount of argon in the air and also filtering up from rocks below, and with excess argon in lava, with argon and potassium water soluble, and argon mobile in rock, we are still expecting this wisp of argon to tell us how old the rock is! One can assume that at the beginning of the flood, many volcanoes erupted and the waters became enriched in Ar Absolute radiometric dating requires a measurable fraction of parent nucleus to remain in the sample rock. If the argon is from decay of potassium within the rock, it will come out at the same temperatures as the potassium-derived argon and in a constant proportion. The rates of exchange that would mess up the dates are very tiny.
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The mathematical expression that relates radioactive decay to geologic time is  . How do we know that maybe all the rocks have excess argon? By measuring the decay products of extinct radionuclides with a mass spectrometer and using isochronplots, it is possible to determine relative ages of different events in the early history of the solar system. Thomas August The cosmic-ray exposure ages of meteorites are usually around 10 million years, but can be up to a billion years for some iron meteorites. Journal of African Earth Sciences. Some examples of these categories are the decaying magnetic field not mentioning the widespread evidence for magnetic reversalsthe saltiness of the oceans not counting sedimentation!