He has told us when that was, in His eyewitness account in the Bible’s first book, Genesis, so we know how old all the rocks are.
If the method fails on rocks when we have an independent eye-witness account, then why should we trust it on other rocks where there are no independent historical cross-checks?
However, we do know Someone who was present when all the earth’s rocks formed—the Creator Himself.
Argon gas, brought up from deep inside the earth within the molten rock, was already present in the lavas when they cooled.
We know the true ages of the rocks because they were observed to form less than 50 years ago.
decay or the rate of other cumulative changes in atoms resulting from radioactivity. The various isotopes of the same element differ in terms of atomic mass but have the same atomic number..