A team of researchers at Université de Lorraine in France, working with a colleague from Brock University in Canada, and one each from Université Clermont Auvergne and Université Lyon, both in France, has found evidence of large deposits of plagioclase feldspar in the walls of Valles Marineris on Mars. In their study, published in the journal Geophysical Research Letters, the group used data from the Mars Reconnaissance Orbiter (MRO) to find the igneous rock and determine what the find might reveal about the history of the planet.