From Newsgroup: sci.space.news

MARS RECONNAISSANCE ORBITER HIRISE IMAGES
April 20, 2011

o Central Peak of Elorza Crater	
  http://hirise.lpl.arizona.edu/ESP_021551_1710

  This crater just north of Ophir Cavus may have intact layering in its 
  central uplift just as several other Valles Marineris craters do.

o The Fun of Change Detection	
  http://hirise.lpl.arizona.edu/ESP_021733_1275

  Seeing evidence that material has recently moved on the Martian surface 
  is a reminder that Mars is a dynamic, changing planet.

o Sorted Boulders	
  http://hirise.lpl.arizona.edu/ESP_021862_1175

  The origins of these boulder fields is not entirely clear, but may be 
  the result of a thinner soil layer overlying the eroding bedrock.

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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