Eolian deposits and dunes on Mars

Detailed analysis of the Mariner 9 pictures reveals that eolian activity is not only a superficial effect, but a surface process of profound importance in the geologic evolution of Mars. Moderate- and large-scale topographic features that may be attributed to wind erosion are described and latitudinal variations in crater morphology are interpreted in terms of eolian deposition and erosion in the mid-latitudes of Mars.