From Newsgroup: sci.space.news

MARS RECONNAISSANCE ORBITER HIRISE IMAGES
April 27, 2011

o Shapes and Gullies
  http://hirise.lpl.arizona.edu/ESP_021491_1440

  This crater is situated on the rim of a much larger crater 
  in Terra Cimmeria, located in the Southern highland region of Mars.

o Rhythmic Stratigraphy	
  http://hirise.lpl.arizona.edu/ESP_021523_1825 
 
  This observation represents a particularly good exposure of rhythmic 
  stratigraphy within a crater in southern Arabia Terra.

o Lots of Layers in Terby Crater	
  http://hirise.lpl.arizona.edu/ESP_021942_1520

  Terby Crater is interesting to scientists because of its apparent 
  modification by liquid water.

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.

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