Creation science and carbon dating
That means Argon atoms which are normally just gaseous become trapped in solid igneous rock.So we know that 100% of all the Argon atoms in an igneous rock got there from decaying Potassium, after it solidified.So that means knowing the ratio of Potassium to Argon in igneous rock lets us know exactly how old it is.So if we see a fossil trapped between two layers that have igneous rocks in them, then we can date the igneous rocks and that will set the bounds for the age of the fossil that was found between them.
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Furthermore we know the rate of decay of Potassium because the decay process gives off a charged particle.
So you can set up detectors on raw Potassium and just measure this decay rate directly.
Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.
The method was developed in the late 1940s by Willard Libby, who received the Nobel Prize in Chemistry for his work in 1960.Research has been ongoing since the 1960s to determine what the proportion of in the atmosphere has been over the past fifty thousand years.The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age.None of this is based on speculative assumptions -- this is extremely hard core, and verified science, that is basic chemistry and basic nuclear physics.