HiRISE: Big block of red bedrock

This image covers a 26-kilometer-wide impact crater northeast of the Hellas impact basin. The crater exposes large blocks of bedrock (called “megabreccia”) in both the central uplift and in the walls of the crater. The enhanced-color subimage from the wall shows a large, approximately 250-meter-wide reddish block, although actually “red” in the infrared-shifted color of HiRISE… [More at link]