Visible here are gullies on the northeast rim of a southern hemisphere crater. Most of the gullies are cut deeply into the crater wall and have narrow channels.
Several of the gully channels have curves—known as meanders—that might indicate that the material the gullies flowed through was easily eroded. The head of many of the gullies can be traced back to the layers exposed on the wall, suggesting that groundwater trickled out of the layers onto the slope.
The floor of the crater contains dark sand dunes as well as some arcuate ridges (wavy features) at the base of the gullies. Arcuate ridges are proposed to be evidence of gravity-driven movement of ice-rich material from the crater walls onto the floor.
Written by: Kelly Kolb (17 July 2008)
This is a stereo pair with PSP_006853_1395 .
More info and image formats at http://hirise.lpl.arizona.edu/PSP_005930_1395
Image: NASA/JPL/University of Arizona