I could see a fast moving impact deposit acting like a turbidite, but I think those lower burns cliff x-beds are too big for that model.

I'll defer to your experience on this matter. Meridiani is large for a medium-scale crater though.

Also, what kind of sed deposits would be left by water rushing back into a crater?

I think that this is where you get your turbidites when the ocean rushes back in. In the Ches. impact models I've seen, the water (not to mention the atmosphere) takes a long time to return to the impact region, relative to the time the transient crater takes to fill with acoustically fluidized slump from the surrounding material. The intense seismic environment of all this excitement will no doubt lead to different sorting and deposition of sediment than even the massive tsunami that eventually returns to the impact site.

We're way past rockhammers now, podro. Which reminds me, time to get mine chrome plated and polished up for another year under my bed. :)