One of the suggested goals for this observation was to investigate the relation of dune material with wall rock as a suspected sand source.
Outcrops emulating dark material are located upslope of the dune field. Adjacent HiRISE images (like PSP_007218_1660) show evidence that the dune material may be locally derived. Overlaps with other HiRISE images also help to monitor for change detection (dune slip faces and rock slides).
Coprates Chasma is part of the large Valles Marineris canyon, the largest one in the Solar System.
This is a stereo pair with ESP_025731_1655.
Photo credit: NASA/JPL/University of Arizona