Re, “Radiometric Dating” in Wikipedia seems fairly straightforward as to history and mechanics. My only real reservation would be in cross-contamination of numerous minerals composing a given rock type, possibly invalidating that sample. But by the article, these appear to be sufficiently addressed to preclude that as well.
Let’s get a better source than Wikipedia.
https://geoinfo.nmt.edu/labs/argon/methods/home.html
K-Ar is not the only form of radiometric dating.
Ever hear of cross-correlation?