Geologically young gullies are a prime target for the HiRISE camera. Gullies are located in a variety of settings and are found all over Mars.
This “ring trough” or eroded pit crater, is located in the rugged southern highland terrain known as Noachis Terra. The HiRISE image shows the layered, boulder-rich wall rock facing to the northeast and gullies that are transporting material downslope.
The material collects into debris aprons along the walls, which often exhibit narrow channels along its surface.
Written by: Sharon Wilson (1 July 2009)
This is a stereo pair with ESP_012767_1320 .
More info and image formats at http://hirise.lpl.arizona.edu/ESP_012912_1320
Image: NASA/JPL/University of Arizona