The wind has stripped off the overlying soil, and created grooves and scallops in the bedrock. The narrow linear ridges are fractures that have been indurated, probably by precipitation of cementing minerals from groundwater flow. The rippled dark blue patches consist of sand.
Written by: Alfred McEwen (13 March 2017)
This is a stereo pair with ESP_012516_1330 .
More info and image formats at http://hirise.lpl.arizona.edu/ESP_012239_1330
Image: NASA/JPL/University of Arizona