Aeolian Features of Scandia Cavi

This HiRISE image shows modified barchan dunes with shapes that resemble “raptor claws.” The unusual morphology of these dunes suggests a limited supply of windblown sand.

Winds likely blew from the northeast resulting in elongate dunes with an asymmetric downwind point. The transverse crests of the smaller ripples/mega-ripple bed-forms surrounding the dune, echo the dominant downwind direction towards the southwest.

This locality is in the Northern Lowlands directly east of Dokka Crater in Scandia Cavi.

Written by: Shirley (Sunny) Rosendahl and Marjorie A. Chan   (30 September 2015)

More info and image formats at

Image: NASA/JPL/University of Arizona