Crater in martian valley Mamers Valles   Crater in Mamers Valles   16 May 2008   The High-Resolution Stereo Camera (HRSC) onboard the ESA spacecraft Mars Express obtained images of a region at the end of Mamers Valles, a long, winding valley. The focus is on a circular depression that contains a crater.           Mamers Valles context map   The data was obtained on 5 August 2006 with a ground resolution of approximately 14 m/pixel. The images are centred at approximately 39° north and 17° east on the planet.       Mamers Valles perspective view     The circular depression seen in the images is approximately 30 km wide and 1400 m deep. It lies at the south-eastern end of Mamers Valles.         Mamers Valles perspective view   The valley of Mamers Valles is approximately 1000 km long, running along the boundary between the northern lowlands and southern highlands in the region of Deuteronilus Mensae.       Mamers Valles nadir view     Scientists term a region such as Mamers Valles ‘fretted terrain’ because it shows numerous deep and wide labyrinth-like valleys and circular depressions. The depressions often show structures formed by liquid flowing on the floor.         Mamers Valles colour-coded elevation model   The structures formed by the flows are thought to be ice-rich debris flows. They show some resemblance to block glaciers seen on Earth       Mamers Valles, annotated nadir view     The patches of rock at the centre of the depression are thought to be remnants of rock that were detached from the flanks of the depression and transported to the centre.         Mamers Valles in 3D   The wrinkle ridges, as the name indicates, are formed by compressive forces acting on the surface. The dark coloured material inside the crater could have formed in-situ or may have been transported by the wind.     The colour scenes have been derived from the three HRSC-colour channels and the nadir channel. The perspective views have been calculated from the Digital Terrain Model derived from the stereo channels.     The anaglyph image was calculated from the nadir and one stereo channel; stereoscopic glasses are required to view it. The black-and-white high-resolution images were derived form the nadir channel, which provides the highest level of detail. For more information on Mars Express HRSC images, please read our updated FAQ (frequently asked questions).   Mars Express image browser  •  - (http://www.esa.int/SPECIALS/Mars_Express/SEMVZF77ESD_0.html) Related articles  •  Hebes Chasma, a trough in the Grand Canyon of Mars (http://www.esa.int/SPECIALS/Mars_Express/SEM565R03EF_0.html)  •  Icy Promethei Planum (http://www.esa.int/SPECIALS/Mars_Express/SEMEX9M5NDF_0.html)  •  Deep valleys of Candor Chasma (http://www.esa.int/SPECIALS/Mars_Express/SEM8Q7VHJCF_0.html)  •  ESA presents Mars in 3D (http://www.esa.int/SPECIALS/Mars_Express/SEM8Q2PR4CF_0.html)  •  Traces of the martian past in the Terby crater (http://www.esa.int/SPECIALS/Mars_Express/SEMSEWEMKBF_0.html)  •  Noctis Labyrinthus, labyrinth of the night (http://www.esa.int/SPECIALS/Mars_Express/SEMWBK73R8F_0.html)  •  Hummocky and shallow Maunder crater (http://www.esa.int/SPECIALS/Mars_Express/SEMOHJAMS7F_0.html)  •  The mysterious ridges at the mouth of Tiu Valles (http://www.esa.int/SPECIALS/Mars_Express/SEMWZZMPQ5F_0.html)  •  Impact Craters in Tyrrhena Terra (http://www.esa.int/SPECIALS/Mars_Express/SEM72PB474F_0.html)  •  Tectonic signatures at Aeolis Mensae (http://www.esa.int/SPECIALS/Mars_Express/SEMF399OY2F_0.html)  •  Breathtaking views of Deuteronilus Mensae on Mars (http://www.esa.int/SPECIALS/Mars_Express/SEMBS5V681F_0.html)  •  The first hiking maps of Mars (http://www.esa.int/SPECIALS/Mars_Express/SEMOI5O2UXE_0.html) Related links  •  High Resolution Stereo Camera (http://berlinadmin.dlr.de/Missions/express/indexeng.shtml)  •  Behind the lens... (http://www.esa.int/SPECIALS/Mars_Express/SEMSXE1PGQD_0.html)  •  Frequently asked questions (http://www.esa.int/SPECIALS/Mars_Express/SEM76D9OY2F_0.html) For specialists  •  ESA Planetary Science archive (PSA) (http://www.rssd.esa.int/PSA)  •  NASA Planetary Data System (http://pds-geosciences.wustl.edu/missions/mars_express/hrsc.htm)  •  HRSC data viewer (http://hrscview.fu-berlin.de)