This pair of craters seen by NASA Mars Odyssey just north of the Hellas Basin demonstrate the rugged topography that can result when an impact occurs on the rim of an existing crater. http://photojournal.jpl.nasa.gov/catalog/PIA04027
This pair of craters seen by NASA Mars Odyssey just north of the Hellas Basin demonstrate the rugged topography that can result when an impact occurs on the rim of an existing crater. http://photojournal.jpl.nasa.gov/catalog/PIA04027