Layered Yardangs
NASA/JPL/University of Arizona
Layered Yardangs
ESP_022774_1865  Science Theme: Sedimentary/Layering Processes
French  Greek  Italian  Portuguese  Spanish 


800  1024  
1152  1280  
1440  1600  
1920  2048  


PDF, 11 x 17 in  


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.

Click to share this post on Twitter Click to share this post on Facebook Click to share this post on Google+ Click to share this post on Tumblr

 Image Products: All image links are drag & drop for HiView, or click to download
B&W: map projected  non-map

IRB color: map projected  non-map

Merged IRB: map projected

Merged RGB: map projected

RGB color: non-map projected

B&W: map-projected (525MB)

IRB color: map-projected (258MB)
B&W: map-projected  (227MB),
non-map  (289MB)

IRB color: map projected  (70MB)
non-map  (212MB)

Merged IRB: map projected  (136MB)

Merged RGB: map-projected  (131MB)

RGB color: non map-projected  (214MB)
Map-projected reduced-resolution (PNG)
Full resolution JP2 download
View anaglyph details page

B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:06 June 2011 Local Mars time:14:11
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

Context map

Usage Policy
All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible: Image: NASA/JPL/University of Arizona
For information about NASA and agency programs on the Web, visit: 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.