And why would God create sedimentary rocks? I would expect that when the earth was created, there would just be basement rock (with the necessary river channels pre-cut throught them) and some amount of created top soil for the vegetation.
So, the question is, looking at all the sedimentary rocks, is how to divide it up into pre-flood, flood, and post-flood. And to explain the vastly different fossilized flora and fauna found within each.
After that, we can talk about the thicknesses of these sedimentary deposits, and ask whether any could be deposited within the requisite amount of time. If the propose flood layer (like the Cretaceous!) contains animal burrows, desert sand dunes, and the like we can ask how these could have formed during the flood.
That's the fun thing about a definite definition -- it makes it obvious that the flood is ridiculous as a geologic explanation. And most people, I would think, would be aware very quickly that the same problems would come up no matter where one puts the flood. I think that is why people very rarely try to present a flood model.
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