McMurdo (Mars)

American station in Antarctica.

Many layers are visible in the south wall of the crater. Rock can form layers in a variety of ways. Volcanoes, wind, or water can produce layers. (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.