Bedrock on a Crater Floor
This enhanced color image shows eroded bedrock on the floor of a large ancient crater.
NB: HiRISE has not been allowed to acquire off-nadir targeted observations for a couple of months due to MRO spacecraft issues, so many high-priority science objectives are on hold. What can be usefully accomplished in nadir mode is sampling of various terrains. Especially interesting are bedrock exposures, which provide information about the geologic history of Mars.
NASA/JPL/University of Arizona (256 km above the surface; enhanced color is less than 1 km across).