Mixed-Tone Streaks in Memnonia. Similar streaks have been produced in wind tunnel simulations. If the wind tunnel results are valid, the dark lobes represent areas of wind erosion, and the bright central portion is a region of deposition where bright fine particles accumulate. Numerous ragged dark streaks are also visible, and are interpreted as zones of erosion associated with topographic obstacles-in this case including crater ramparts, ejecta blankets, and possible lava flow fronts. The image is about 220 km across.
North is to the upper left.