The methods that caused the early geologists to conclude that the so-called "biblical timeline" was a load of hooey were much simpler:
1) Observe a natural process creating something (sand on a beach, erosion exposing more of underlying granite, ad infinitum, ad nauseum).
2) Measure the rate at which the process is proceeding.
3) Measure how much (sand, exposed granite, ad infinitum, ad nauseum).
4) Back calculate how long it's been going on.
Through thousands upon thousands of examples, conclude that the idea that the earth is 6-10,000 years old is errant nonsense.
Your misinformation or willful ignorance on dating methods doesn't even have to enter into the question.
Sorry my friend the but if you are nauseated you should use Peptobismal or quick posting responding to topics the involve evolution or creation.