Layers and Fractures in Ophir Chasma, Mars Ophir Chasma forms the northern portion of the vast Mars canyon system Valles Marineris, and this image, acquired on Aug. 10, 2015, by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter, features a small part of its wall and floor. via NASA http://ift.tt/1RIGilw