This observation from NASA Mars Reconnaissance Orbiter shows the edge of a dark dune field on the floor of Proctor Crater in the Southern highlands of Mars. The dark dunes are composed of basaltic sand that has collected on the bottom of the crater.
This observation from NASA Mars Reconnaissance Orbiter shows the edge of a dark dune field on the floor of Proctor Crater in the Southern highlands of Mars. The dark dunes are composed of basaltic sand that has collected on the bottom of the crater.