Literalist, are you aware that limestone is currently being deposited and it requires specific temperatures, depth, biota, and time?
What creationists need to do is explain how exactly flood waters can deposit and form limestone, shale, sandstone, siltstone, dolomite, diatomite, evaporites, volcanic layers, lithified sand dunes, conglomerates, mega-conglomerates, tuffs, etc., and all these rocks are intercalated throughout the entire rock record.
Not only that, creationists also have to explain how these flood-deposited rocks can have animal tracks, nests, paleosols (ancient soil horizons), roots, paleokarsts, eolian deposition (cross-bedding in dunes), red beds (required oxygen), and a whole host of other things.
Today, we can see all of these sediments being deposited and the environments in which they occur (except for maybe dolomite) - NONE of which involve flood waters.