Proof of that is the image we have here, showing the floor of the Coprates Chasma, a large canyon included in the Valles Marineris. We’re looking at an area of just 1.1 by 9 km (0.7 by 5.5 miles), yet it shows “a tremendous variety of rock types, as indicated by their colors and textures.”
The image was captured back in 2007 with the help of the HiRISE camera from 264 km (164 miles) high in orbit around the planet, and shows according to the people from NASA and the University of Arizona, who are studying such images, fractured and faulted blocks of bedrock that may be more than 3 billion years old, but also much younger sediments brought to the region by wind and water, when there was water flowing on the surface.
The place got people so worked up about it that they now say “it would be wonderful to land a rover here for surface exploration and perhaps return rock samples to study on Earth.”
Such an idea is not at all far-fetched, as presently NASA and ESA are testing equipment that will be used to retrieve samples currently being gathered by the Perseverance rover. Sadly, at the time of writing no mission is being planned for the Coprates Chasma region.