Sand dunes are among the most widespread aeolian (wind-formed) features present on Mars. Their spatial distribution and morphology are affected by changes in wind direction and wind strength. Patterns of dune erosion and deposition provide insight into the sedimentary history of the surrounding terrain.

This image shows sand dunes trapped in an impact crater in Noachis Terra. Dunes and sand ripples of various shapes and sizes, such as in this enhanced-color subimage , show the natural beauty created by physical processes.

Written by: Alfred McEwen and Ginny Gulick   (25 January 2012)

This is a stereo pair with ESP_024976_1375 .

More info and image formats at http://hirise.lpl.arizona.edu/ESP_025042_1375

Image: NASA/JPL/University of Arizona