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30 October 2004 This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows shallow tributary valleys in the Ismenius Lacus fretted terrain region of northern Arabia Terra. These valleys exhibit a variety of typical fretted terrain valley wall and floor textures, including a lineated, pitted material somewhat reminiscent of the surface of a brain. Origins for these features are still being debated within the Mars science community; there are no clear analogs to these landforms on Earth. This image is located near 39.9N, 332.1W. The picture covers an area about 3 km (1.9 mi) wide. Sunlight illuminates the scene from the lower left.

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      EUN,LOM,LRE4,hdl:10494/254419,work-cmr-id:254419,http://photojournal.jpl.nasa.gov:http://photojournal.jpl.nasa.gov/catalog/PIA06976,ilox,learning resource exchange,LRE metadata application profile,LRE

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