Slipher (Mars)

Named after Vesto M. Slipher - American astronomer (1875-1969) and Earl C. Slipher - American astronomer (1883-1964).

Gullies are visible on the walls of a crater that is on the rim. Martian gullies are small, incised networks of narrow channels and their associated downslope sediment deposits, found on the planet of Mars. (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.