I don't see how much of what you have stated contradicts what I have posted.You are correct. The polystrate fossils had to be buried within a short period of time; that is my contention as well. And we also now know that the polystrate fossilized trees in Yellowstone Park were most likely all a result of one event, rather like that at Spirit Lake, not the burial of multiple forests on top of each other--simply that different species of trees sunk to the bottom of a lake at different rates based on the characteristics of their wood (how quickly they absorbed the water), so landed on the bottom at different times as the lake filled with more sediment.
Of course, the layers are sorted by the size of the particulate. And the worldwide flood consisted of many events, not just one. The only item that is contradictory is your uniformitarian worldview assumption of billions of years.
I shook it to get the water throughout the dirt. Then I let the bottle sit. Isn't that the way you said you did your experiment? The courser and heavier particles settle to the bottom.
As the continents rose over at least months if not years after the inundation of the flood, the waters rushed off the surface causing catastrophic erosion of the surfaces, which is where the sediment from the layers come from.
And yes, during the worldwide flood there were huge amounts of heat energy released into the oceans from tectonics and volcanism. This is what is needed for an ice age--lots of moisture going into clouds from warm oceans and dropping on cool continents, which were a result of the atmosphere with significant particulate matter from volcanic activity blocking sunlight on the continents--for more than a hundred years. That also accounts for why there was no ice cover in the arctic areas of the earth--the warm oceans surrounding it. Is there a better explanation (not better storytelling) for how ice ages form? I don't think so.