NASA/JPL/Malin Space Science Systems
Yardangs are ridges formed by wind erosion. The classic, "textbook" examples of yardangs are those that appear to be like the inverted hull of a boat. They most commonly form in sedimentary rock or volcanic ash deposits that contain some proportion of sand-sized grains. This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows yardangs in the Aeolis region of Mars. Their tapered ends point toward the upper left, indicating the dominant winds responsible for their erosion came from the lower right. This picture is located near 1.0°N, 214.4°W. It is illuminated by sunlight from the lower left.
Malin Space Science Systems and the California Institute of Technology built the MOC using spare hardware from the Mars Observer mission. MSSS operates the camera from its facilities in San Diego, California. The Jet Propulsion Laboratory's Mars Surveyor Operations Project operates the Mars Global Surveyor spacecraft with its industrial partner, Lockheed Martin Astronautics, from facilities in Pasadena, California and Denver, Colorado.