They arc accumulated in an approximately triangular dune mass that occupies the center of the mosaic. The discontinuous dark texture on the right side arises from partial dune cover. Perennial ice is visible near the top of the frame and associated with the crater near tile bottom of the frame. The bright patch near center right may be a cloud. The dunes form a sharp-edged, dark band near the bottom of this image.
Martian sand is dark, unlike Earth sands which are usually light colored.
This shows the minerals in Martian rocks most resistant to erosion are the dark ones. The center of the image shows a flat desert region. Vague circular forms are probably buried craters, and bright spots within the ridges are ice deposits. Vague circular forms again are probably buried craters. The bright patches of ice near the upper left are associated with a distinct change in the dune pattern, possibly indicating that the deposits of ice preceded the development of the present dune pattern.