Notable features in Sirenum Fossae
Notable features in Sirenum Fossae
This image of the Sirenum Fossae region of Mars, obtained with the the High Resolution Stereo Camera (HRSC) on board Mars Express, portrays three notable features. The image shows the region centred at about 28°S, 185°E. The largest impact crater in box 1 is close to 50 kilometres in diameter, and indicates that this region is ancient because such large craters rarely formed in more recent times. There is a large valley system in box two, and two parallel lines to the left-hand side of the box. These form a graben.
The central impact crater in box three has a diameter of about 28 kilometres, and is relatively young because its centre remains jagged rather than having been smoothed by erosion. The youngest crater is the small crater with a diameter of nine kilometres. The crater at the bottom of the box is 34 kilometres across, and the largest crater in the box, 56 kilometres in diameter, is the oldest and most eroded.