Syd:That the methods verify each other only demonstrates that they've been calibrated against each other. Or that they've chosen fudge factors that agree with other fudge factors.
That's not exactly how scientific proofs come into existence and why they are widely held as being true. Take for example the Fermat's Last theorem. All laid out in the link. This is how the scientific process works. http://mathworld.wolfram.com/FermatsLastTheorem.html The dating techniques outlined by others here work the same way.and are open to refinement to proof or open to be discredited not on a whim or someones say so or for financial gain but based on proof.
I first read about Fermat when I was a child and I was and still am fascinated by him. The only assumptions we now have are weather or not he really had the proof to begin with and just didn't have the room to write it down at the time. As far as scientific proofs go you will get just as much adulation and praiseworthy esteem heaped on you if you can prove one of science's key precepts is false as you will get if you can corroborate one as being true. Read over the link and think about it. That's all I ask.