Sublimation at the South Polar Residual Cap (Absolute Natural Colors; credits: Dr Paolo C. Fienga - Lunexit Team)

Caption NASA:"This MGS-MOC image shows a portion of the South Polar Residual Cap where the effects of Sublimation are apparent.
Over extended periods of time, Sublimation "eats" away at the smoother appearing material (largely composed of frozen CO2), darkening the Scarps and creating the irregularly shaped depressions that are present throughout much of the scene".

Location near: 87,1° South Lat. and 69,3° West Long.
Image width: ~3 Km (~1,9 miles)
Illumination from: upper left
Season: Southern Summer