The same catchments that drained the Flood waters, rapidly eroding soft sediments into gorges, are also the catchments that provide the source for these same rivers today.
How fast would they be draining? Wouldn't draining Flood waters tend to exhibit sheet flow instead of stream flow?
Layers have been proven beyond doubt to form in seconds and minutes under rapid flow. (See numerous posts on this web site).
I agree that there are some instances where that happens.
What about layers that contain ash and bentonite deposits specific to that layer? For example if the layer below an ash deposit and the layer above don't have that ash, it is highly improbable the sequence formed in minutes.
Firstly most of the geo-col comes from a single environment - marine inundation on to land.
That's also true, to the best of my knowledge, but why does each inundation bring with it such widely varying fauna?