Presumably your "layer of sediment" is the iridium attributed to the meteorite impact. So it's not a significant layer of sediment and its nature makes the meteorite a far more likely explanation that than a flood.
This quote you provide:
Fossilization requires rapid burial. Yet such burial is exceedingly rare today, and fossilization is almost non-existent in modern times. The existence of massive numbers of fossils worldwide is clear evidence of quick, deep, mass burial. A global flood catastrophe would offer conditions most ideal to the location of great numbers of fossils. The fossils give evidence that the animals were killed suddenly.
1) Fossilisation does require that the processes that tend to lead to the destruction of remains are somehow inhibited. But rapid burial is not the only way. Anoxic conditions found at the bottom of certain lakes can also serve. Also relevant is the fact that rapid burial need not be by water - sandstorms account for some examples (e.g. dinosaur remains found in the Gobi desert).
2) Although some fossils preserve soft parts the vast majority do not. Vertebrate remains are typically disarticulated (i.e. the bones are seperated and spread out - and often not all of them are found). Even feathers are rarely preserved - which is why we have only recently discovered that some (non-avian) dinosaurs had feathers. Thus there can be a period between death and burial where decay may occur - and no need to infer sudden death in many cases.
3) Rare events spread over a long period of time would also account for the number of fossils. Thus there is no need to attribute all fossils to a single short period of time.
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