Trough Deposits on Mars Point to Complex Hydrologic Past

Catherine Weitz, a senior scientist at the Tucson-based Planetary Science Institute, has reported new evidence for multiple, water-related geologic processes on Mars.
She and her colleagues studied light-toned deposits (LTDs) within troughs of the Noctis Labyrinthus region in western Valles Marineris using data gathered by three Mars Reconnaissance Orbiter (MRO) instruments: the High Resolution Imaging Science [...]

Full story at http://spacefellowship.com/2009/12/16/trough-deposits-on-mars-point-to-complex-hydrologic-past/