Last updated on April 24, 2014 at 12:23 EDT
Russell Crater Dunes Defrosted PSP0040381255
11662 of 13064

Russell Crater Dunes, Defrosted PSP_004038_1255

August 8, 2007
The Russell Crater dune field is covered seasonally by carbon dioxide frost, and this image shows the dune field after the frost has sublimated (evaporated directly from solid to gas). There are just a few patches left of the bright seasonal frost.

Numerous dark dust devil tracks can be seen meandering across the dunes. The face of the largest dune is lined with gullies. The source of the gullies is unclear but could involve erosion by the seasonal carbon dioxide ice.