In this marvelous VIS image, taken by the NASA - Mars Odyssey Orbiter on September, 4th, 2015, and during its 60.884th orbit around the Red Planet, we can see part of the Margin (---> Edge) of the North Polar Permanent Cap.
Layering (most likely made of of Water Ice) is visible in the top half (---> center) of the image, while small Dunes (actually, it is a relatively tiny Dunefield), located on the Icy Plains surrounding the Cap itself, are (is) clearly visible in the upper left (Sx) corner of the frame.
Latitude (centered): 82,9278° North
Longitude (centered): 110,0090° East
This image (which is an Original Mars Odyssey Orbiter b/w and Map Projected frame published on the NASA - Planetary Photojournal with the ID n. PIA 20096) has been additionally processed, magnified to aid the visibility of the details, extra-contrast enhanced and sharpened, Gamma corrected and then colorized in Absolute Natural Colors (such as the colors that a normal human eye would actually perceive if someone were onboard the NASA - Mars Odyssey Orbiter and then looked down, towards the Surface of Mars), by using an original technique created - and, in time, dramatically improved - by the Lunar Explorer Italia Team.