Seashells on tops of mountains.

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As per the thread topic, more important is whether a preflood planet earth as well as it's atmosphere would have been different than it is today. Imo that is the big question as to the accuracy of dating methodology.

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Well if you had a plausible model of a pre-flood Earth that would affect dating methods and a model for how it could have changed and some evidence that the Earth actually was like that before the alleged Flood then it might be a big question.Last time I asked it was obvious that you had none of these.And strong evidence that modern dating methods do work has been presented in the threads dealing with the correlations between them.So it really isn't a big question. is it ?

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Using logic and reasoning all I can offer as a layman is that a greenhouse canopy type atmosphere would have had different properties than ours which would likely affect the whole ecosystem of the planet which in turn would likely render modern dating methodoly inaccurate. This would likely be the reason that humans lived multiple century lives as per the Biblical record.

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So basically your idea of "logic and reasoning" does not require you to have any understanding of what you are talking about. You think that a "greenhouse canopy type atmosphere" is the sort of difference there might be in your assumed "pre-flood" world and therefore you assume that it would also affect the decay rates of radioactive elements and all the other dating methods that give results you don't like.Well it won't The idea is complete nonsense. If you really employed logic and reasoning you would actually look at the underlying science to see if your idea had any plausiblity at all. Radioactive decay rates are part of basic physics - not significantly affected by temperature rises that would be more than sufficient to wipe out all life on Earth, or by chemistry (which would be reflected in the rocks anyway) and it would be even more laughable to suggest that the ecosysytem is likely to do it.You're not using logic and reason. All you're doing is groping after excuses that look good to you.