Olivier Audet

I'd ask for a source to those last two statements. As far as I know, your point on carbon dating is pretty much a fallacy because radiocarbon dating does not depend on HOW MUCH carbon exists or existed, but HOW FAST it decays, which as far as we know is a constant. If you have proof to the contrary, show it, because no respected scientist has heard of it.

As for specimens "crossing" multiple layers of the geologic column, as far as I know, that's only a hypothetical situation, an example of what WOULD render that method of dating unreliable. I've never seen a claim of it that was remotely reliable.