[X] My Assistant

[Burmese]

http://marsrovers.jpl.nasa.gov/gallery/all...4P1131L0M1.HTML

I'm betting those dark crumbling rocks are the remnants of ejecta hurled from a crater (Victoria perhaps) made long after the lakebed dried up.

[dvandorn]

Maybe these dark rocks are fragments of what lies beneath the evaporite layer? Erebus is the largest impact structure we've come close to, we ought to be traveling right now over the degraded remains of its ejecta blanket. The soft mostly-salt evaporite rocks that probably made up most of the ejecta blanket have weathered down to a flat plain, but if small, very shocked pieces of whatever underlied the evaporite layer were mixed in with the evaporite in the ejecta blanket, I would expect to see such chunks lying out on the ground, the softer evaporite having eroded away around it.

-the other Doug