Eastern Valles Marineris Bedrock Stratigraphy and Falling Dunes
NASA/JPL/University of Arizona

Eastern Valles Marineris Bedrock Stratigraphy and Falling Dunes
PSP_010277_1650  Science Theme: Geologic Contacts/Stratigraphy
French   Spanish   Italian   Icelandic   Greek   


720p (MP4)  
Listen to the text  


800  1024  
1152  1280  
1440  1600  
1920  2048  
2560  2880 


PDF, 11 x 17 in  


This image shows a transect of approximately 8-kilometers of Coprates Chasma wall stratigraphy, which includes (moving down sequence): the southern plateau, wall spurs, fans of eroded material, gullies, sand dunes, and canyon floor.

Dunes located in the center left show slip faces on the downhill side and aligned with the local gradient, indicating down slope transport (see subimage, white arrow). These “falling dunes” are a type of topographically-controlled sand dune that formed when down-slope winds were focused by the gully topography. Although rare across Mars, eastern Coprates Chasma has an abundance of these falling dunes, particularly on north-facing walls.

As with all dunes, wind regime, sediment supply, topography, and climate are all important factors in where dunes form and persist. An abundant sand supply from local wall layer and persistent down-slope winds are likely contributors to why these dunes are so common here.

Note: the above image (and the subimage) are non map-projected, so north is approximately down).

Also take a look at the digital terrain map made with this image pair.

Written by: Matthew Chojnacki   (22 May 2013)

This is a stereo pair with PSP_010699_1650.

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
Grayscale: map projected  non-map

IRB color: map projected  non-map

Merged IRB: map projected

Merged RGB: map projected

RGB color: non-map projected

Grayscale: map-projected (311.1 MB)

IRB color: map-projected (167.5 MB)

Grayscale: map-projected  (157.0 MB),
non-map  (159.9 MB)

IRB color: map projected  (59.5 MB)
non-map  (164.2 MB)

Merged IRB: map projected  (322.9 MB)

Merged RGB: map-projected  (288.3 MB)

RGB color: non map-projected  (149.9 MB)

Map-projected reduced-resolution (PNG)
Full resolution JP2 download
View anaglyph details page

DTM details page

Grayscale label   Color label
Merged IRB label   Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:05 October 2008 Local Mars time: 3:42 PM
Latitude (centered):-14.693° Longitude (East):302.410°
Range to target site:264.5 km (165.3 miles)Original image scale range:52.9 cm/pixel (with 2 x 2 binning) so objects ~159 cm across are resolved
Map projected scale:50 cm/pixel and North is upMap projection:Equirectangular
Emission angle:8.8° Phase angle:56.3°
Solar incidence angle:63°, with the Sun about 27° above the horizon Solar longitude:137.1°, Northern Summer
For non-map projected products:
North azimuth:97° Sub-solar azimuth:34.7°
For map-projected products
North azimuth:270°Sub solar azimuth:207.4°

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: 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.