The lower part of this image shows well-defined overlapping channels, which have inverted topography (i.e., they were once low spots that have been filled in with sediments and now eroded in a such a way that they appear as topographically high regions).
The channels have a winding and intersecting geometry indicating the shifting of the channels over time, a feature consistent with the flow of water in rivers. The channels have small craters that have excavated the channel materials and ejected them to form well-defined rays. There are dark slope streaks (toward the top of the image) showing transport of fine dust down the slope of an eroded bedrock terrain.Written by: John Grotzinger (28 March 2008)
This is a stereo pair with ESP_019736_1750 .
More info and image formats at http://hirise.lpl.arizona.edu/PSP_007394_1750
Image: NASA/JPL/University of Arizona