This image samples the excellent bedrock exposures north of Terby Crater, which lies on the northern rim of the giant Hellas basin.
An enhanced-color cutout shows a sample of this bedrock , which has a variety of colors and textures. The warm-colored bedrock probably contains hydrated minerals such as clays, whereas the blue-green bedrock is dominated by unaltered mafic minerals. These may be some of the oldest rocks exposed at the Martian surface. Such ancient rocks are extremely rare on Earth.
Written by: Alfred McEwen (audio: Tre Gibbs) (29 June 2016)
More info and image formats at http://hirise.lpl.arizona.edu/ESP_045335_1535
Image: NASA/JPL/University of Arizona