Possible Inverted Topography Landscape with Clay Minerals
NASA/JPL/University of Arizona

Possible Inverted Topography Landscape with Clay Minerals
ESP_022077_2000  Science Theme: Future Exploration/Landing Sites
Spanish Portuguese Italian Greek 



WALLPAPER

800  1024  
1152  1280  
1440  1600  
1920  2048  
2560  

HIFLYER

PDF, 11 x 17 in  
This site, near Mawrth Vallis is intriguing for several reasons. First of all, there are lots of little knobs and plateaus that may expose layers of sedimentary rock. As on Earth, sedimentary rock on Mars is expected to hold clues to the conditions under which it formed - clues to the past environment and climate.

Second, many of the larger, darker plateaus appear fairly round. Typically Mars' surface is pock-marked with round depressions of impact craters. However, these round areas are raised up relative to the surroundings. This may be an example of inverted topography, in which an impact depression may have become filled with material which was, or became, harder than the surrounding terrain, and thus was more resistant to later erosion. Example materials may be solidified molten rock created during the impact event, or sediments that hardened due to alteration by water ponding within the crater.

Third, clay minerals, called phyllosilicates, have been detected here by other spacecraft instruments. Clays are exciting because they indicate there was most likely water around here long ago. Determining which layers and knobs contain the clays, and how widespread they are, will help scientists determine how much water existed here and for how long.

This site has been deemed so interesting that it is under consideration for a visit by a future landed rover.

Written by: Patrick Russell   (11 May 2011)

This is a stereo pair with ESP_022367_2000.

  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 (869.5 MB)
IRB color: map-projected (355.8 MB)

JP2 EXTRAS
Grayscale: map-projected  (379.1 MB),
non-map  (464.8 MB)
IRB color: map projected  (134.2 MB)
non-map  (328.5 MB)
Merged IRB: map projected  (231.8 MB)
Merged RGB: map-projected  (223.9 MB)
RGB color: non map-projected  (331.5 MB)

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

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:12 April 2011 Local Mars time: 2:39 PM
Latitude (centered):19.802° Longitude (East):342.665°
Range to target site:281.9 km (176.2 miles)Original image scale range:28.2 cm/pixel (with 1 x 1 binning) so objects ~85 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:1.8° Phase angle:58.2°
Solar incidence angle:59°, with the Sun about 31° above the horizon Solar longitude:272.7°, Northern Winter
For non-map projected products:
North azimuth:97° Sub-solar azimuth:317.9°
For map-projected products
North azimuth:270°Sub solar azimuth:133.1°

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.