This image covers an impact crater roughly 4 kilometers (2.5 miles) in diameter. The subimage shows just a small segment of the crater rim (1336 x 889; 3 MB). The surface outside the crater (top) is relatively dark, while the interior wall of the crater has a lighter tone. A few dark patches on the crater wall have small dunes or ripples on their surfaces, and are likely pits filled with dark sand.

The light-toned material making up the crater wall is finely layered and fractured in places. The layers may be part of a sedimentary or volcanic ash deposit that became indurated (cemented and solidified) prior to the impact that formed the crater. The impact has revealed layers that were previously buried beneath the Martian surface, similar to the craters explored by the Opportunity rover in Meridiani Planum. These craters are windows into the Martian subsurface.

Just 30 kilometers (20 miles) to the east of this crater lies Mawrth Vallis, an ancient outflow channel that may have been carved by catastrophic floods. The orbiting spectrometers OMEGA (on Mars Express) and CRISM (on MRO) have detected clay minerals in layered deposits in and around Mawrth Vallis. These minerals, which require water to form, are likely present in the layered bedrock exposed in this crater wall. The crater may thus provide a glimpse into an intriguing period of Martian history, when liquid water may have been more abundant at or near the Martian surface than it is today.
Written by: James Wray

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

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.