This large crescent dune in Kaiser Crater shows the scars of many types of seasonal erosional activities. Along its downwind slope are large gullies
which are active during winter, when frost drives dune material downslope, carving out channels and creating fan-shaped aprons.
On the upwind slope (bottom), dust devil tracks are visible: dark lines and curlicues created during the spring season by small wind vortices vacuuming up a thin layer of dust and exposing the dark dune sand.
Note: Both the cutout and the above image are rotated so that North is to the right.ID
: 9 January 2011 altitude
: 253 km
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