Water-Rich Terrain (IMAGE) Brown University Caption This three-dimensional image of a trough in the Nili Fossae region of Mars shows phyllosilcates (in magenta and blue hues) concentrated on the slopes of mesas and along canyon walls. The abundance of phyllosilcates show that water played a sizable role in changing the minerals of a variety of terrains in Mars's early history. Credit NASA/JPL/JHUAPL/University of Arizona/Brown University Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.