BTW - I should never have mentioned carbon dating. You are absolutely correct in what you said about it and dating geological layers:

Quote:

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It should be understood that estimating the ages of rocks using radiometric dating is an entirely separate technique from the radiocarbon (C-14) method for dating organic remains. Radiometric dating of rocks is based on the decay of long lived isotopes of Potassium, Thorium, and Uranium. Radiocarbon dating is based on the decay of the short lived C-14 isotope and is irrelevant to determining the age of the Earth.

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But I think there may be problems with these dating methods as well. For example, the above quote states that they measure the decay of isotopes such as Potassium, Thorium and Uranium. But there could be problems. The dating methods ASSUME that there is X amount of these isotopes to begin with in order to judge the age of these rocks. While these isotopes do decay and their decay rates are known, there are other ways of introducing materials into rock, to remove materials and to even increase/decrease decay rates. As a result, these dating methods are guesswork at best.