The large white arrow points to a steep cliff exposure of dark-toned rock. Each boulder left behind a trail on the relatively soft, dusty slope.
Illumination is from the lower left.
The picture was acquired in January 1998 during the MGS Aerobrake-1 Orbits imaging campaign, and was presented at the 30th Lunar and Planetary Science Conference in Houston, Texas, March 1999. The ASU Planetary Geology Group is under the direction of Dr. Ronald Greeley.