HiRISE | Scoured Bedrock on the Floor of Eos Chasma (ESP_012940

NASA/JPL/University of Arizona

Scoured Bedrock on the Floor of Eos Chasma
ESP_012940_1655 Science Theme: Geologic Contacts/Stratigraphy

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The scoured and scabby floor of Eos Chasma, located east of Valles Marineris, is covered with dunes or ripples and eroded craters. The reddish-brown color likely represents older, eroded basalt. Much of this erosion may have been accomplished by water.

An eroded crater exposes compositional differences below the surface: the bluish tones are probably fresher, boulder-rich exposures of basalt and the lighter-toned material near the base of the crater wall may have a different composition. The bottom of the crater is filled with material that is similarly-toned to the surface of Eos Chasma, and was likely eroded and transported there by the wind.
Written by: Sharon Wilson (13 May 2009)

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Acquisition date:	30 April 2009	Local Mars time:	3:14 PM
Latitude (centered):	-14.1 degrees	Longitude (East):	318.3 degrees
Range to target site:	265.1 km (165.7 miles)	Original image scale range:	53.0 cm/pixel (with 2 x 2 binning) so objects ~159 cm across are resolved
Map projected scale:	50 cm/pixel and North is up	Map projection:	EQUIRECTANGULAR
Emission angle:	6.7 degrees	Phase angle:	40.3 degrees
Solar incidence angle:	47 degrees, with the Sun about 43 degrees above the horizon	Solar longitude:	257.0 degrees, Northern Autumn
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North azimuth:	97 degrees	Sub-solar azimuth:	345.5 degrees
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North azimuth:	270 degrees	Sub solar azimuth:	159.7 degrees

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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.