CTX images and HiRISE images from the Mars Reconnaissance Orbiter have shown that the crater contains gullies. Martian Gullies are believed to have formed through rather recent flows of liquid water. (wikipedia entry)
A crater is a circular depression likely created by an impact event. On Mars large craters are named after deceased scientists, writers and others who have contributed to the lore of Mars. Small creaters (less than 60km) are named after small towns and villages.