Gullies with Meanders (Corozal Crater)
NASA/JPL/University of Arizona
Gullies with Meanders (Corozal Crater)
PSP_006261_1410  Science Theme: Fluvial Processes


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This observation features a relatively pristine crater in the southern mid-latitudes. The crater still has a sharp rim on its south end, but it has experienced modification since forming.

The north half of the crater is populated by a large number of gullies that appear to emanate from resistant layers. The layers likely continue around the crater, but the gullies do not. Distinct layers are visible on the south wall of the crater. It is unknown why gullies form on certain slopes and not others. Interestingly, the gullies themselves are not so pristine. They are covered by dunes and cut by polygonal fractures, indicating that they have been modified by aeolian (wind-driven) and periglacial (ground ice) processes, respectively.

There are a large number of boulder tracks visible on the crater walls. Boulder tracks typically are approximately constant in width, and can often be seen at the track ends. The crater floor has a texture indicative of sublimation processes. (Sublimation is when something goes directly from a solid to a gas phase, skipping a liquid phase.) If a soil is ice-rich under Martian conditions, the ice can sublimate causing the ground to collapse and “crinkle” where the ice used to be.

Written by: Kelly Kolb   (11 January 2008)

This is a stereo pair with ESP_014093_1410.

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Acquisition date
27 November 2007

Local Mars time:

Latitude (centered)

Longitude (East)

Range to target site
254.4 km (159.0 miles)

Original image scale range
25.4 cm/pixel (with 1 x 1 binning) so objects ~76 cm across are resolved

Map projected scale
25 cm/pixel and North is up

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Emission angle:

Phase angle:

Solar incidence angle
49°, with the Sun about 41° above the horizon

Solar longitude
353.8°, Northern Winter

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Sub-solar azimuth:
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For information about NASA and agency programs on the Web, visit: 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.