This image is of a pedestal crater at 43 degrees north. The lobate pattern around the circular crater is where the crater ejecta landed. This area is now raised above the level of the surrounding plains, forming a mesa, or plateau, with the crater at the center.
This suggests that at one time the surface of the whole region was at this level. The ejecta from the crater covered the area near the crater and protected it, while the surrounding region was eroded away, leaving the crater high standing. This material may have been removed because it was loose and/or cemented with ice.
Pedestal craters are particularly interesting because some ice may still be present in the mesa, protected by the ejecta surface.
Written by: Patrick Russell (26 September 2012)
This is a stereo pair with ESP_035771_2230 .
More info and image formats at http://hirise.lpl.arizona.edu/ESP_028598_2230
Image: NASA/JPL/University of Arizona