This oval mesa is a remnant of a geological unit that once covered this area, similar to the mesas and buttes in Monument Valley, in Arizona and Utah. This is a small remnant of a much larger unit of similar material that caps Ganges Mensa to the west.

As can be seen in the sides of this small mesa, this remnant consists of a layered stack of rock. Prior to the massive erosion that left this a high-standing mesa, a more gentle phase of erosion created the small hills and whorls on the upper surface of the mesa. It seems that this gentle erosion continued even after the mesa was created, as this pattern of small hills and whorls is visible on the terrain surrounding the mesa.

Although not visible in the area shown in this HiRISE image, this mesa actually sits on top of the much larger Ganges Mensa, which is itself a large mesa within Ganges Chasma.

Written by: Ross Beyer

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.