This stunning image shows the traces left behind from dust devils, that have scoured the top layer of the surface and exposed the darker substrate.
Dust devils are fairly common on Mars, sometimes leaving brighter trails rather than dark ones. Over time, we can see beautiful lines criss-crossing the sand.
This caption is based on the original science rationale.
Written by: HiRISE Science Team (16 September 2009)
More info and image formats at http://hirise.lpl.arizona.edu/ESP_014185_1095
Image: NASA/JPL/University of Arizona