Light-toned Layers in Eos Chaos
NASA/JPL/University of Arizona

Light-toned Layers in Eos Chaos
PSP_005385_1640  Science Theme: Sedimentary/Layering Processes



WALLPAPER

800  1024  
1152  1280  
1600  
1920  2048  
This image shows an outcrop of light-toned rock in Eos Chaos, a knobby region which transitions into the Eos Chasma. The outcrop is exposed in the wall of a mesa (a flat-topped, steep-sided plateau).

The outcrop is prominent in the eastern part of the image. Most of the material is light and shows many small scarps or benches. In places these appear to indicate boundaries between layers, but they are often discontinuous. The light material is buried by a thin mantle of dark material in places; the dark material is from other rock layers—possibly those above the outcrop&mdashand has fallen or been blown over the light rock.

Near the top of the outcrop, there is a distinctive layer that appears as a dark band at low resolution. At the full resolution of HiRISE, this appears to be a layer breaking up into angular boulders, indicating different rock properties than the underlying light rock. There does appear to be some light material above this layer, suggesting that the process that deposited the light material continued for some time.

Ultimately, the mesa is capped by a thin veneer of dark material with a rippled texture, forming most of the southern part of the image. These ripples likely formed by wind blowing sand or dust, but they may have become indurated (hardened) enough to become inactive, since they are not found within small craters on the mesa top.

The light deposits could have formed by a variety of processes. Proposed deposition mechanisms for light-toned sediments on Mars include those from rivers or lakes, volcanic ash or wind-blown sand or dust. The dark boulder-rich band is also of uncertain origin, but it is likely harder rock, more resistant to erosion.Written by: Colin Dundas   (22 February 2008)

  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
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 (912.9 MB)
IRB color: map-projected (354.7 MB)

JP2 EXTRAS
Grayscale: map-projected  (396.4 MB),
non-map  (555.5 MB)
IRB color: map projected  (150.7 MB)
non-map  (429.2 MB)
Merged IRB: map projected  (219.6 MB)
Merged RGB: map-projected  (210.9 MB)
RGB color: non map-projected  (416.6 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:20 September 2007 Local Mars time: 2:17 PM
Latitude (centered):-15.739° Longitude (East):313.203°
Range to target site:263.9 km (164.9 miles)Original image scale range:26.4 cm/pixel (with 1 x 1 binning) so objects ~79 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:0.2° Phase angle:32.9°
Solar incidence angle:33°, with the Sun about 57° above the horizon Solar longitude:316.9°, Northern Winter
For non-map projected products:
North azimuth:97° Sub-solar azimuth:358.3°
For map-projected products
North azimuth:270°Sub solar azimuth:173.0°

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.