From Newsgroup: sci.space.news

MARS RECONNAISSANCE ORBITER HIRISE IMAGES
May 4, 2011

o The Western Wall of Holden Crater	
  http://hirise.lpl.arizona.edu/ESP_021946_1535

  Hydrothermal deposits may represent evidence for a habitable 
  environment on Mars.  

o Exposures of Layered Rocks in the Argyre Region	
  http://hirise.lpl.arizona.edu/ESP_021947_1300

  This observation shows great exposures of layered rocks in 
  Argyre region. Could it be evidence for an ancient sea or lake?

o New Impact Cluster	
  http://hirise.lpl.arizona.edu/ESP_022057_2070

  With the combination of CTX and HiRISE monitoring, a crucial aspect 
  of Mars science is being detailed for the first time -- the current 
  surface cratering rate.

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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