Wow! Looks like we've got an honest to god outcrop of something near the lander. Hard to imagine how that slabby patch (actually, looks like it might be elongated, like a little "ridge") could be impact fragments. To the extent that a non-geologist watching webcast photos can judge anything, it sure looks like that's an actual eroded outcrop of something -- and something that likes to erode in flat lying slabs (which as Squires noted, could just as easily be volcanic as sedimentary, lest anyone get too excited).

And pretty amazing lack of rocks or pebbles near the lander, it seems. Very, very, fine stuff given how well it holds the airbag imprints. Which is interesting -- shouldnt there be some rock fragments from impact? "Impact gardening" ought to produce more of a mix of sizes, I thought, not just a pretty even layer of fines.

But I'll shut up for now and wait for better pictures and sharper minds, given that it's now 5am and three beers... :)