Interesting textures?
I don't think that's rock Tom. Look at how the stones and pebbles get pushed down into the regolith ("soil"). If there were a sheet of bare rock just underground, you couldn't do that.
I think it's just a real neat imprint of the airbag folds, with a couple of real pebbles to give it a "plum pudding" texture.
I bet if you got real good images you'de see the weave of the airbag fabric!
Nonetheless, it tells us interesting stuff about the physical nature of the soil, as I discuss in my other reply in this thread.