Faunal succession, and the deposits it is seen in are particularly spectacular in contradicting flood geology models. (I study Neogene, Quaternary, and Recent mollusks, so I have seen a decent amount of such things). I still have yet to see any halfway-plausible explanation of coastal marine deposits from a YEC view.
How does one get 10 different patchy layers, each with index fossils, some of the unconsolidated ones with mud that takes days to settle out of still water (I should know, we’ve sieved over a ton of the material), the consolidated ones experiencing groundwater percolating through them for a while (fastest way to make limestone) before the next layer comes in, a record of dozens of individual transgression/regression pulses with associated organisms ranging from freshwater to mid-shelf (50-80 m depth of ocean), and a column of sedimentary deposits 3 kilometers thick out of one flood?
And how can one possibly deal with global planktonic foraminifera correlations in that scenario?