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Last updated on April 17, 2014 at 5:43 EDT
Nirgal Vallis
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Nirgal Vallis

January 3, 2014
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows the floor and walls of a small portion of Nirgal Vallis. The floor is covered by large windblown ripples. The valley wall near the center right exhibits a group of gullies, formed perhaps by a combination of mass movement and possibly seepage and runoff of groundwater.

Credits: NASA/JPL/Malin Space Science Systems