A Spanish research team, using 3-D reflection seismology, has for the first time mapped the geomorphological features of the Ebro river basin 5 to 6 million years ago. The images obtained show that the surface analysed is today 2.5 or 3 kilometres below the sea bed. "The results shed light on the way in which the sea level fell during the Messinian (between 5.33 and 6 million years ago), and imply that the subsequent inundation of the river margins happened extremely quickly," says Roger Urgeles, lead author of the study and a researcher at the Department of Marine Geology of...