However, the authors were conscious that many ancient rivers were not being found. (sciencedaily.com)
«Some of the observed features included ancient river beds, craters, massive extinct volcanoes, canyons, layered polar deposits, evidence of wind - driven deposition and erosion of sediments, weather fronts, ice clouds, localized dust storms, morning fogs and more,» NASA wrote in a summary of the mission. (space.com)
«Fossil specimen reveals a new species of ancient river dolphin.» (sciencedaily.com)