Layered Yardangs
NASA/JPL/University of Arizona

Layered Yardangs
ESP_022774_1865  Science Theme: Sedimentary/Layering Processes
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This observation shows terrain on the floor of a large, degraded crater. Many sharp ridges are visible across the image, all of them aligned in a similar direction. There are patches of dark sand in the low areas between the ridges and on the ridge slopes.

What creates these sharp ridges? This layered terrain has been sculpted by the wind. The aligned ridges are called yardangs, which are formed in areas where the dominant erosional force is the wind. Yardangs are also found on Earth, usually in very dry areas.

The subimage shows a closeup of some yardangs.

Written by: Anjani Polit   (28 September 2011)

This is a stereo pair with ESP_023051_1865.



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Acquisition date:06 June 2011 Local Mars time: 2:11 PM
Latitude (centered):6.322° Longitude (East):34.689°
Range to target site:273.1 km (170.7 miles)Original image scale range:27.3 cm/pixel (with 1 x 1 binning) so objects ~82 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:2.2° Phase angle:43.7°
Solar incidence angle:42°, with the Sun about 48° above the horizon Solar longitude:305.9°, Northern Winter
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North azimuth:97° Sub-solar azimuth:325.5°
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North azimuth:270°Sub solar azimuth:140.0°

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For information about NASA and agency programs on the Web, visit: http://www.nasa.gov. NASA's Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA's Science Mission Directorate, Washington. Lockheed Martin Space Systems is the prime contractor for the project and built the spacecraft. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona. The image data were processed using the U.S. Geological Survey’s ISIS3 software.