There's not enough sediment on the whole surface of the earth at any one time--land surface and ocean bottom combined---to create miles thick sequences of sedimentary strata everywhere around the world, nor is there enough time to erode that amount in a single year even at catastrophic flood rates of erosion
Not sure how you can be so definitive about that a whole planet was covered in water over the mountain tops and most of the water drained back into, what that looked like I cannot imagine.
I'm starting to get the impression that you're side-stepping a question for which you have no answer - you have only to view the considerable depth of the Grand Canyon to see for yourself just how much material has built up in the form of sedimentary strata (layers).
tbwp10 and I accept the scientific explanation of the laying down of sediments over geological time but you insist the entire structure was formed in only days or weeks(?).
The amount of sedimentary material involved is staggering and has to be measured in millions of cubic kilometres globally. No such amount of loose material has ever been seen just lying around on the surface. You need to address the question of how it originated if you expect your model of events to be credible.
...The passage very clearly says the windows of Heaven were opened and the fountains of the deep were broken up and it rained for forty days. I think the fountains of the deep breaking up indicates a traumatic event but I can't be dogmatic about it. It also said that the waters afterwards receded, not evaporated. Also a cataclysmic event.
But if it's being proposed that those verses describe some real event in the planet's history, it's important that the description makes sense, yes?
So what does 'the fountains of the great deep' mean? If some part of a described event is unclear, ambiguous or incomprehensible, it casts doubt on the rest.
"I can't be dogmatic" - that's an encouraging change 😉