<p>Yardang-Forming Materials of the Memnonia Sulci Region — Memnonia Sulci is located southwest of Olympus Mons. The linear ridges are called yardangs and form by wind removal of semi-cemented material. The ridges are parallel to wind direction. 
</p><p>NASA/JPL/University of Arizona (272 km above the surface; scene is less than 5 km across and north is to the right.)
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2018-04-19 10:44
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