The Memnonia Sulci region is southeast of Elysium Planitia at the boundary between the smooth lowlands and cratered southern highlands.
This region is characterized by yardangs, which are ridges formed by wind erosion of the regional deposits. In the subimage, you can see the individual layers of these deposits. These are commonly believed to be fine ash layers but they could also be sedimentary in origin, deposited either by wind or water. Some isolated patches of dunes are also visible throughout the image, abutting the ridges of the yardangs. Written by: Alix (29 November 2007)
More info and image formats at http://hirise.lpl.arizona.edu/PSP_005904_1725
Image: NASA/JPL/University of Arizona