Impact crater filled with sediment

Impact crater filled with sediment
The contours of this 30-kilometre-wide crater in the right half of the image can barely be made out. Over billions of years, erosion has stripped away most of the rim, which was once several thousand metres high. The interior of the crater has been filled with a flat layer of sediment, which was presumably – at least in part – transported and deposited in the interior of the crater by a river. The entry point of the river valley can still be seen to the upper right in the background of the image. The smaller crater in the centre of the image is substantially younger, as it cuts into the rim of the larger crater and still has considerably more sharply defined contours.
Copyright note:
As a joint undertaking by DLR, ESA and FU Berlin, the Mars Express HRSC images are published under a Creative Commons licence since December 2014: ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO. This licence will also apply to all HRSC images released to date.

ESA/DLR/FU Berlin, CC BY-SA 3.0 IGO.