NASA Eroded Layers in Shalbatana Valles

Layers, probably sedimentary in origin, have undergone extensive erosion in this image from NASA's Mars Reconnaissance Orbiter (MRO) of Shalbatana Valles, a prominent channel that cuts through Xanthe Terra. via NASA http://www.nasa.gov/image-feature/jpl/eroded-layers-in-shalbatana-valles