Now this may be something. It is sort of an hypothesis:
IN general, the higher you go in the column the better able was the creature to put off death in the flood, the ones in the top layers then being the ones that succumbed latest. It no doubt also had something to do with opportunity of course - the availability of high ground or trees to climb and so on, competition with other animals as well as the animal's own direct abilities to survive. The size of the dinosaurs would have been in their favor, as would the birds' ability to fly and find the highest perches. Marine animals, amphibians, smaller animals, ground-dwelling animals, would have had the least chance, while big animals, climbers, flyers, speedy and smart creatures would have had the best chance.
So, lets go on from there. Now, from your hypothesis, make some predictions. If the ability to escape rapid flooding would determine the relative positions in the strata, what would you expect to see? Let's see... It seems to me that a very fast predator, say one of the many bipedal predatory dinosaurs, would be better suited to this task then, say, a mouse. So, one might expect to find bipedal dinosaur fossils in higher strata then mice.
Is that the case? If it is you have some support for your hypothesis. If it isn't, your hypothesis is disproved.
I don't know for sure which it is, but I can guess.
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