The layers shown in this image formed by loose sediment accumulating within Becquerel Crater.

The layers are interesting in that there are repeated cycles of thick and thin layers. These cyclic changes in layer thickness shows that some environmental conditions varied in a repeated way as each subsequent layer was deposited.

These variations may be due to annual climate cycles and/or a cyclic variability in the source of the sediment. Most layers are parallel to each other, indicating that deposition occurred by material settling onto the surface. A few layers are cross-bedded, meaning that they are not parallel to the older or younger layers.

Cross-bedding indicates that at the time that the layers were deposited, the sediment was transported along the ground surface by wind or water.
Written by: Chris Okubo

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.