1. Ph.D. Fellow of the National Council of Scientific and Technical Researches (CONICET), College of Engineering and Water Sciences, Littoral National Univ., Ciudad Universitaria, C.C. 217, (3000), Santa Fe, Argentina. E-mail: rszupian@fich1.unl.edu.ar
2. Researcher, National Council of Scientific and Technical Researches (CONICET), College of Engineering and Water Sciences, Littoral National Univ., Ciudad Universitaria, C.C. 217, (3000), Santa Fe, Argentina. E-mail: mamsler@fich1.unl.edu.ar
3. Threet Professor of Sedimentary Geology and Professor of Geography, Dept. of Geology and Geography and Ven Te Chow Hydrosystems Laboratory, Univ. of Illinois at Urbana-Champaign, 1301 W. Green St., Urbana, IL 61801. E-mail: jimbest@uiuc.edu
4. Research Fellow, Natural Environment Research Council, Earth and Biosphere Institute, School of Earth and Environment, Univ. of Leeds, Woodhouse Lane, Leeds, LS2 9JT, U.K. E-mail: d.parsons@see.leeds.ac.uk