Layer Outcrops and Dunes
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Layer Outcrops and Dunes

December 1, 2003
This October 2003 Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) picture shows dark, windblown sand dunes amid outcrops of light-toned, sedimentary rock in a crater in western Arabia Terra. The darkest material in the scene is windblown sand; the steep slopes -- the slip faces -- of the dunes face toward the southwest (lower left), indicating that wind transport of sand has been from the northeast (upper right). The layered mounds are the remains of sedimentary rock that were once more extensive across this crater floor. The image is located near 8.9°N, 1.2°W, and covers an area 3 km (1.9 mi) wide. Sunlight illuminates the scene from the lower left.

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