Diverse Layers and Mineralogy near Mawrth Vallis
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Diverse Layers and Mineralogy near Mawrth Vallis

October 28, 2011
This HiRISE image shows diverse layers in a region near Mawrth Vallis, a channel that was probably carved by water in Mars' ancient past. The color subimage shows details of layers exposed in a crater wall.

Tannish to white tones are apparent, which may be reflective of differences in mineralogy. CRISM, a spectrometer on MRO, has detected clays in Mawrth, so the layers here may be clay-rich.

Clays contain water, indicating that this region may have been wet in the past. The subimage also shows polygonal-like textures on some of the layered rock. These may be dessication polygons formed when the wet clays dried. The dark patches on the layers are sand dunes.

Written by: Nathan Bridges

Credit: NASA/JPL/University of Arizona

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