<HTML>This of course is the well-worn ploy of trying to use the `hard' sciences as a stick to beat archaeology with - and as such, desperately naive about the topics it touches on.
You set up an opposition between archaeologist's `conjectures' and rigorous scientific dating, yet in Schoch's case (which seems to be the case you're interested in) you conceed `that there are certain unknowns associated with weathering processes which make dating via this method somewhat tentative' - or, in a word, conjectural. Moving from the particular to the general, there's a strong case for regarding not just scientific dating but science <i>per se</i> as conjectural: see in particular Popper's <i>Conjectures and Refutations</i>. The authoritarian notion of `Chemists, Physisicists and Geologists' handing down pronouncements from the mountain is untrue to the way science works.
It's interesting that John Anthony West for one rejects this facile view, questioning the `hardness' of geology and noting for example that some working geologists manage to reconcile their discipline with the creation account in <i>Genesis</i>. See the section `How hard is geology?' in the revised edition of <i>Serpent in the Sky</i>.
It occurs to me that it might not be archaeology which has nothing to contribute to this debate.</HTML>