Universidad de Salamanca, Departamento de Geología. Facultad de Ciencias, Salamanca, 37008 Spain
Universidad de Salamanca, Departamento de Geología. Facultad de Ciencias, Salamanca, 37008 Spain
Northern Illinois University DeKalb, Department of Geology and Environmental Geosciences Northern Illinois University DeKalb, Illinois, IL 60115 815- United States
Stanford University, Department of Geological and Environmental Sciences, Stanford, CA 94305-2115 United States