This HiRISE image is located on the carbon-dioxide rich residual south polar ice cap near 86 degrees South, 353 degrees East. These rounded landforms evolve relatively quickly and erode into the surface of the ice cap (approximately 4-5 meters or 15 feet per year).
Their interesting shapes make for a striking appearance on the surface.
Written by: Sharon Wilson (13 May 2009)
More info and image formats at http://hirise.lpl.arizona.edu/ESP_012941_0930
Image: NASA/JPL/University of Arizona