Crommlin Crater is an impact crater in the Oxia Palus quadrangle of Mars. It is located at 5.1° north and 10.2° west. It was named after Andrew C. Crommlin, a British astronomer (1865–1939). Parts of Crommlin crater display many thin layers. These may reflect different climates in the past—some of which were much wetter. Many places on Mars show rocks arranged in layers. Rock can form layers in a variety of ways. Volcanoes, wind, or water can produce layers. * Crommlin Crater with important parts labeled, as seen by CTX camera (on Mars Reconnaissance Orbiter). * * *