The dark markings in this VIS image are tracks made by the passage of "dust devils". Dust devils are common in the extensive plains of the northern latitudes. This image is located in Utopia Planitia.
Orbit Number: 53315 Latitude: 55.0129 Longitude: 91.1792 Instrument: VIS Captured: 2013-12-20 20:43
Photo credit: NASA/JPL-Caltech/Arizona State University