This image from the Compact Reconnaissance Imaging Spectrometer for Mars (CRISM) shows a region just south of Mawrth Vallis, a channel cut by floodwaters deep into the highlands. This image includes four renderings of the data, all map-projected. At top left is an approximately true-color representation. The top right image is false color, showing brightness of the surface at selected infrared wavelengths. The bottom left image shows areas high in iron-rich clay, and the bottom right image shows areas high in aluminum-rich clay. Credit: NASA/JPL/JHUAPL/Brown University
