Image Credit: NASA/JPL/ASU

Context image credit: NASA/JPL/MOLA
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Strange-looking grooved terrain overlies lava flows off of the western flank of the giant shield volcano Arsia Mons. It has recently been speculated that the large, concentric ridges are glacial features called moraines, which were deposited as a dry-bottomed glacier receded and left sand and rocks behind. Lava flows are visible to the south and hints of flow margins can be seen within the ridged region. Wind action is represented by both the windstreaks behind the craters and the mega-ripples (a dune form) a the margin of the ridged region.