Speleothem isotopic evidence for rapid human-induced expansion of grasslands in Madagascar at 890 CE

Stephen J Burns1, Laurie Godfrey2, Peterson Faina3, David McGee4, Benjamin F Hardt5, Lovasoa Ranivoharimanana3 and Jeannot Randrianasy3, (1)University of Massachusetts Amherst, Department of Geosciences, Amherst, MA, United States, (2)University of Massachusetts, Amherst, MA, United States, (3)University of Antananarivo, Antananarivo, Madagascar, (4)Massachusetts Institute of Technology, Earth, Atmospheric and Planetary Sciences, Cambridge, United States, (5)USGS Headquarters, Reston, VA, United States