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Mawrth Vallis is one of the oldest valleys on Mars. It was formed in and subsequently covered by layered rocks, from beneath which it is now being exhumed. The rocks surrounding the valley have been observed by the Omega spectrometer aboard the European Space Agency's Mars Express spacecraft, which found them to include minerals with water bound within their structure. Thus, the Mawrth Vallis region is of keen interest to the team using the mineral-mapping Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) on NASA's Mars Reconnaissance Orbiter. The CRISM team requested this image by the orbiter's Context Camera in support of a CRISM observation during orbiter's transition phase testing of instruments. The image is centered near 25.6 degrees north, 19.4 degrees west. photojournal.jpl.nasa.gov
Originally posted by ThePieMaN
I see what you are saying that it looks like a body of water but I believe its just sand dunes. As a mater of fact on the large picture you can even see that the sand is blowing out of the crater 5 o'clock position. Those same patterns of dunes are all over that large 25mb pic...especially up towards the top.