Nature 2014 Sep;513(7518):409-13
1] Institute for Archaeological Sciences, University of Tübingen, Tübingen 72074, Germany. [2] Senckenberg Centre for Human Evolution and Palaeoenvironment, University of Tübingen, 72070 Tübingen, Germany. [3] Max Planck Institut für Geschichte und Naturwissenschaften, Jena 07745, Germany.