A close-up view of the eroded terrain in Nili Fossae using a CRISM infrared image to colorize a high-resolution HiRISE camera image. Beneath a rough-textured capping rock unit (purple) are banded olivine-bearing layers (yellow) which in some places have been partially altered to carbonate (bright green). The image is approximately 2.5 km across. Credit NASA/JPL/JHUAPL/University of Arizona/Brown University