Paris, Dec 12 : Data and images from Mars Express suggest that groundwater springs played a much important role in shaping the surface of the Red Planet than previously believed, and may have even sheltered primitive life forms as the planet started drying up.
Light Toned Deposits (LTDs) - martian sediments that most closely resemble sediments on Earth - are some of the most mysterious sediments on Mars. Causes for their origin remain unknown.
These deposits occur on a large scale in Arabia Terra, Chaotic Terrain and Valles Marineris, close to the Tharsis volcanic bulge.
Until now, different mechanisms, including volcanic processes, have been proposed for their formation.