well, they don't neccessarily prove an
old earth, just that geologic column was laid down sequentially -- ie: the law of superposition.
but it is distinctly hard to swallow the yec line with knowledge that each stratum was laid down independently, sequentially. and when you know that strata do not exactly form quickly... you also end up with the conclusion that geologic column represents a timeline of a portion of the history of the earth, something yec's don't like.
i've never seen a yec come up with a good explanation for angular unconformities, especially the ones that involve distortions of solid rock, but then again, i've never seen a yec come with a good explanation for anything. i have seen the "flood" thing tried, but that seems to be the magic yec answer for everything.
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