Impact crater Nicholson
Nicholson Crater is located northwest of a region called Medusae Fossae on Mars. In the centre of this crater a massif rises around 3.5 km above the floor, which is approximately 55 km long and 37 km wide.
Video: "Flight over Nicholson Crater" from 2008 [3:56 min]
Copyright: ESA/DLR/FU Berlin (G. Neukum)
The 100 km wide Nicholson Crater is located near the highland-lowland dichotomy of Mars. Dichotomy means the boundary between the northern lowlands and the southern highlands. The origin of the massif in the crater centre is still being debated. Probably these are eolian (wind blown) deposits, which is obvious from the numerous rilles and ridges that cur the massif. The soft sediments that make up the massif were sanded at high wind speed. Resulting erosinal features are called yardangs.
Link to release in press archive: Nicholson Crater Animation (Aug 19, 2011)