Oh my, that's a question that usually gets covered in them long papers on flood geology (ya know, the boring ones)
I'm not really into geology, so I don't know the conventional layer names at all. I have a book about it though, but it's at my parents hous ...
From my personnal memory and deduction abilities hehe, I would think that pretty much all the sedimentary layers were deposited during the flood, maybe here and there some post flood layers appeared, and also maybe some pre-flood layers exist at the very beginning. But overall, all sedimentary layers containing fossils were deposited during the flood.
And so as soon as you start having lots of fossils (read here: the cambrian explosion layers) then you have the beginning of the flood-deposited layers, which would stretch all the way to the upper-most layers.
The real question here I guess is which layers are linked with what stages of the flood. Because in the current creationist model of the flood, there were multiple stages to it.
Some layers at the same place could actually have been deposited at the same time during the flood, and so where a long-age geologist (note I didn't say evolutionist
) would see multiple layers of thousands/millions of years, a flood geologist would see one layer deposited by a flow of water, which produced multiple 'artificial layers' because the grains arranged in terms of size etc.
As I've said, I hope this is clear, as it isn't my 'specialty' and so I have fewer english vocabulary on this, since I read about it less often.