This image shows what appears to be a highly elliptical crater, which would be unusual.

Closer examination reveals that it is probably two overlapping craters that formed concurrently, plus several smaller craters aligned with the long axis of the elliptical depression.

This type of crater chain can form from a highly oblique impact, in which the bolide trajectory is almost parallel to the surface.

Written by: Alfred McEwen   (26 January 2011)

More info and image formats at http://hirise.lpl.arizona.edu/ESP_020793_1935

Image: NASA/JPL/University of Arizona