HiRISE | Dark-Toned Unit Exposed atop Crater Ejecta in Meridiani Planum (PSP_003392

NASA/JPL/University of Arizona

Dark-Toned Unit Exposed atop Crater Ejecta in Meridiani Planum
PSP_003392_1825 Science Theme: Sedimentary/Layering Processes

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This image shows the contact between two geologic units: a cratered plains unit and an etched terrain unit.

The cratered plains are relatively smooth and dark, while the brighter etched terrain consists of smooth plains and dune fields.

The etched terrain occupies the lowest portions of an approximately 120 kilometer NW-SE trending valley with a wide variety of landforms suggestive of wind erosion. Both units partially cover the ejecta from an approximately 20 kilometer crater directly to the northeast of the image.

Original release: May 2007.
Written by: Jennifer Griffes (15 September 2010)

This is a stereo pair with PSP_002680_1825.

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Acquisition date:	17 April 2007	Local Mars time:	3:23 PM
Latitude (centered):	2.2 degrees	Longitude (East):	-0.3 degrees
Range to target site:	315.8 km (197.4 miles)	Original image scale range:	31.6 cm/pixel (with 1 x 1 binning) so objects ~95 cm across are resolved
Map projected scale:	25 cm/pixel and North is up	Map projection:	EQUIRECTANGULAR
Emission angle:	32.1 degrees	Phase angle:	84.7 degrees
Solar incidence angle:	54 degrees, with the Sun about 36 degrees above the horizon	Solar longitude:	221.0 degrees, Northern Autumn
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North azimuth:	96 degrees	Sub-solar azimuth:	340.0 degrees
For map-projected products
North azimuth:	270 degrees	Sub solar azimuth:	157.9 degrees

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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

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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.