“Megabreccia” is a term we use to describe jumbled, fragmented blocks of rock larger than 1 meter across, in a matrix of finer-grained materials. It’s the result of energetic processes, typically from an impact event.
This image was acquired by HiRISE only in the narrow color strip, as a ridealong with a CRISM target, since HiRISE had previously imaged this location.
Written by: HiRISE Science Team (10 April 2013)
More info and image formats at http://hirise.lpl.arizona.edu/ESP_023099_1545
Image: NASA/JPL/University of Arizona