Light-Toned Layered Rocks in Arabia and East Xanthe Regions
NASA/JPL/University of Arizona

Light-Toned Layered Rocks in Arabia and East Xanthe Regions
ESP_020732_2000  Science Theme: Sedimentary/Layering Processes
EspañolItalianoGreek



WALLPAPER

800  1024  
1152  1280  
1440  1600  
1920  2048  
2560  

HIFLYER

PDF, 11 x 17 in  

HISLIDES

PowerPoint  
Keynote  
PDF  
The banding in this image has been interpreted based on MOC images to be layering. A critical goal of this observation is to provide points of comparision with HiRISE full resolution coverage and CRISM infrared spectra of light-toned rock outcrops in other areas of the Mawrth Vallis region.

The dark terrain at the north end of the image is heavily cratered and has thus been there (at the surface) longer than the brighter terrain in the rest of the image. But is it older, as heavily cratered terrain often indicates?

The dark terrain appears to be higher in elevation, which in layered terrain usually means that it is actually younger than the bright terrain (lower layers are deposited first). One possibility is that the bright terrain used to be covered with the darker material also, but that that darker material has been stripped off and removed, revealing the brighter layers and terrain below. If this is indeed the case, then the low bright terrain could actually be older and it has fewer craters only because it has been more recently exposed to the surface. Clues to this are small high-standing knobs throughout the bright terrain that could be remnants of once more-widespread higher topography.

Also, the larger circular to oval patches, or "islands" of smooth dark material within the bright material are also high-standing. They may be old impact craters, exterior to which erosion has removed dark terrain, but interior to which the crater walls or some hardening process has protected the dark terrain from erosion. Such terrain is called "inverted topography" because a crater depression which was once empty and low has become filled, and the material outside of the crater has been removed while the material inside the crater hasn't - producing relief opposite to that of the original landscape.

Written by: Patrick Russell   (9 November 2011)



 Image Products: All image links are drag & drop for HiView, or click to download
JPEG
Grayscale: map projected  non-map
IRB color: map projected  non-map
Merged IRB: map projected
Merged RGB: map projected
RGB color: non-map projected

JP2 DOWNLOAD
Grayscale: map-projected (443.4 MB)
IRB color: map-projected (292.0 MB)

JP2 EXTRAS
Grayscale: map-projected  (261.6 MB),
non-map  (226.2 MB)
IRB color: map projected  (165.0 MB)
non-map  (267.0 MB)
Merged IRB: map projected  (489.0 MB)
Merged RGB: map-projected  (448.2 MB)
RGB color: non map-projected  (249.7 MB)

ADDITIONAL IMAGE INFORMATION
Grayscale label   Color label
Merged IRB label   Merged RGB label
EDR products

About color products (PDF)
HiView main page

 Observation Toolbox
Acquisition date:28 December 2010 Local Mars time: 3:31 PM
Latitude (centered):19.916° Longitude (East):342.542°
Range to target site:284.8 km (178.0 miles)Original image scale range:57.0 cm/pixel (with 2 x 2 binning) so objects ~171 cm across are resolved
Map projected scale:50 cm/pixel and North is upMap projection:Equirectangular
Emission angle:5.9° Phase angle:66.2°
Solar incidence angle:61°, with the Sun about 29° above the horizon Solar longitude:207.0°, Northern Autumn
For non-map projected products:
North azimuth:97° Sub-solar azimuth:339.7°
For map-projected products
North azimuth:270°Sub solar azimuth:154.4°

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
Postscript
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.