"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 ride-along with a CRISM target, since HiRISE had previously imaged this location.
Photo credit: NASA/JPL/University of Arizona
Note: This image is located in northern Terra Cimmeria, near the "shore" of Elysium Planitia. The closest named feature is Al-Qahira Vallis, to the northwest.