Most fossils do form under plain old ordinary sediment deposition. No flash flood or anything else drastic. If you go to a beach, many shells that you find are actually decades to centuries or more old. But most fossils are also not so impressive looking, at least without microscopy. Whale bones are not always broken down quickly. Bones and shells are hard and somewhat slow to break down, so it just depends on the relative speed of whatever is breaking things down versus how fast it’s getting buried. A geology paper reported finding an old chain about a meter down on a small island in the Bahamas. With visions of Spanish gold in their heads, they asked casually about the spot and found out that someone had put a chain their to anchor their boat a few decades ago. Areas close to large continents get lots of sand and mud eroding off the land. The North American interior seaway filled largely with sand and mud eroding off the mountains to either side, with a fair contribution from skeletal bits and some volcanic ash.
Storms and underwater landslides are relatively mundane events that produce fining upward packets of sediment. Coarsening upward sediment layers could be produced by water getting shallower, among other possible situations. Anywhere around the globe today, if any sediment is accumulating, you find sediment piling up on some days and not on others. That gives you layering. A global flood within one year, as proposed by modern young-earth claims cannot produce the layers that we see. The major sequence stratigraphic units are not explainable by a global flood. They have countless features that require slow deposition over huge amounts of time. For example, the Castille Formation in the Permian of the Delaware Basin in west Texas has alternating fine layers of salt minerals and organic-rich limestone. Salt deposition cannot occur during a global flood as envisioned in YEC models. If the water was salty enough to precipitate salt, it was salty enough to kill most aquatic life. Formation of each layer takes some time, and there are vast numbers of layers. The Castille alone has over 100,000 layers. The most likely explanation is that they reflect seasonal change - salt from the dry season and organic-rich in the wet season. And that’s just one unit with many deposits above and below. There are reefs occurring at many levels in the geologic sequence, which could not form during a YEC flood.
Giant waves as envisioned in the flood model you are proposing would not produce the observed patterns. (They would require enough energy that the earth would vaporize, though, making modeling their other effects somewhat pointless.) There are plenty of tsunami deposits that have been studied for comparison. The large-scale units of geologic layers are not tsunami deposits. The “Great Unconformity” below the Sauk transgression reflects erosion on the supercontinent of Rodinia, as well as the initial transgression of the succeeding ocean in some areas. In places, there are lake and glacier deposits. The unconformity could not possibly have been produced by a few catastrophic waves.
A tenable scientific model must carefully examine what it predicts and compare that to the evidence.