Crater with Gullies on a Central Structure
NASA/JPL/University of Arizona

Crater with Gullies on a Central Structure
ESP_025082_2295  Science Theme: Glacial/Periglacial Processes
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The 40-kilometer diameter unnamed crater (49 degrees North, 21 degrees East) in this image is located west of Lyot Crater and north of Deuteronilus Mensae in the Northern Plains of Mars.

As seen in the subimage, gully systems in the central structure have eroded underlying layers (undercutting) that are less resistant to erosion than the surface rock of the central structure. Previous channelized water flows likely transported the eroded sediments toward the southeast and deposited them forming the expansive debris aprons.

The formation of channels on the debris aprons supports the hypothesis that these sediments were transported down the gullies and then deposited onto the aprons by flowing water. In the larger, northernmost system, sediments have partially filled in the channel segments and winds have remobilized these sediments forming the dunes that line the gullies.

Written by: Ginny Gulick   (1 February 2012)

This is a stereo pair with PSP_009298_2295.

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Acquisition date:02 December 2011 Local Mars time: 2:45 PM
Latitude (centered):49.137° Longitude (East):21.055°
Range to target site:335.5 km (209.7 miles)Original image scale range:33.6 cm/pixel (with 1 x 1 binning) so objects ~101 cm across are resolved
Map projected scale:25 cm/pixel and North is upMap projection:Equirectangular
Emission angle:25.5° Phase angle:27.1°
Solar incidence angle:48°, with the Sun about 42° above the horizon Solar longitude:38.0°, Northern Spring
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North azimuth:96° Sub-solar azimuth:330.3°
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North azimuth:270°Sub solar azimuth:151.3°

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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.