While I obviously have not personally watched processes taking place over more than a few decades, that is enough time for certain geologic settings to encase shells and bones into rock (particularly for carbonate settings). I have collected a huge number of fossils as well as recent shells and have seen the patterns of change through time. I have organized major museum fossil collections. I have seen the sediments that the fossils are in. I have studied geology. Thus, I do have some relevant observations. You have not observed tsunamis do any of the things that you claim that they do - think carefully whether you are being consistent in your standards.
The young-earth flood is not biblical. Genesis 2 indicates that the geography of Eden is recognizable today, whereas modern young-earth models have a flood supposedly depositing much of the geologic column (though they can’t figure out which parts are during versus before versus after). Flood geology arguments also do not honor God in their quality and are unbiblical in that sense as well.
Certainly a slow and gradual rise in oceans can deposit millions of cubic kilometers of ocean sediments across large parts of North America. Just think about how much sediment is deposited on our beaches today.
Deposition according to Walther’s Law is incompatible with giant tsunamis. The Tapeats Sandstone is coastal sand. At the same time, in deeper water, you have mud, which became the Bright Angel Shale. Further out, beyond where most of the mud and sand eroding off the land has accumulated, much of the sediment is carbonate skeleton bits form ocean life, which becomes the Muav Limestone. As the ocean gradually rises, the beach gradually moves inland, followed by the clay mud, followed by the lime mud. If the young-earth model were true, they should all be mixed together in a tsunami-style deposit, not side by side and gradually replacing each other. The types of fossil change as you go up in each of these layers, showing that each one was deposited over vast amounts of time.
If you go to a rocky coastline such as the west or northeastern coasts of the US, you may see basement granite eroding. Your claims that ordinary erosion could not do that are based on personal incredulity, not on actually investigating geological processes.
Speeding up plate tectonics to largely take place during a one year flood requires earth-vaporizing amounts of energy. The pattern of volcanoes is incompatible with a young earth - the series such as in the Hawaiian-Emperor chain each must have time to build up, then erode, as they slowly move over the hot spot.
Tsunamis cannot form the individual layers of the Castille Formation - tsunamis cannot deposit fine layers of gypsum and organic-rich limestone over a hundred miles. Even if they could, that would require 11.5 tsunamis per day for an entire year, just to form the Castille. You are not checking whether your explanations actually work; rather, you just trying to use “tsunami” as an explanation for everything while denying that conventional geology works. The reality, however, is that many things can happen in a few billion years - there is room for a lot of different processes in earth history, whereas there is not room in a young-earth model. God works miracles, but not ones that merely serve to make it look like the miracle didn’t happen. Old-earth geology works for finding resources and for matching what we actually observe in the geologic record. Young-earth geology is entirely an effort to make a particular interpretation of Genesis 1 seem more credible; it does not work if you actually want to find anything in the earth.
