NASA Mars Reconnaissance Orbiter HIRISE images September 28, 2011

o Layered Yardangs
http://hirise.lpl.arizona.edu/ESP_022774_1865
The aligned ridges are called yardangs, which are formed in areas where the dominant erosional force is the wind.

o Tithonium Chasma
http://hirise.lpl.arizona.edu/ESP_023029_1755

This complicated landscape of craters, slopes, and boulders is in an area called Tithonium Chasma, a large trough that is itself a part of the more well-known canyon system Valles Marineris.

o Gullies and Curved Ridges at the Base of Crater Walls
http://hirise.lpl.arizona.edu/ESP_023328_1325

These features likely formed during a period of high obliquity (tens of millions of years ago).

o A Network of Dust Devil Tracks
http://hirise.lpl.arizona.edu/ESP_023734_1270

The entire area in this image has been recently crossed by multiple dust devils.

All of the HiRISE images are archived here: http://hirise.lpl.arizona.edu/

Information about the Mars Reconnaissance Orbiter is online at http://www.nasa.gov/mro. The mission is managed by NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology, for the NASA Science Mission Directorate, Washington, D.C. Lockheed Martin Space Systems, of Denver, is the prime contractor and built the spacecraft. HiRISE is operated by the University of Arizona. Ball Aerospace and Technologies Corp., of Boulder, Colo., built the HiRISE instrument.