HiRISE: Layers and sand in Schiaparelli Crater

Schiaparelli Crater is a 460 kilometer (286 mile) wide multi-ring structure. However, it is a very shallow crater, apparently filled by younger materials such as lava and/or fluvial and aeolian sediments. Most of the floor is covered by a thin layer of dust, but in places where there are patches of dark sand, there is also well-exposed bedrock… [More at link]