This image is of the rim of a crater. The Sun is low in the sky (only 15 degrees above the horizon) and shining full on this crater wall (you can see that the area beyond the rim has got long shadows).
The Sun is beautifully illuminating a series of layers exposed in the crater wall which have a variety of different colors.
Note: the subimage is non map-projected, so approximate North is down.
Photo credit: NASA/JPL/University of Arizona
Note: This crater is located in Noachis Terra to the northwest of Argyre Planitia. The closest named crater is Tábor, which is a very short distance to the northwest.