CHANGING DRIVERS OF HOLOCENE DROUGHTS IN THE NORTHERN GREAT PLAINS
SMITH, Alison, Geology, Kent State University, Kent, OH 44242, DONOVAN, Joe, Department of Geology and Geography (Emeritus), West Virginia University, 330 Brooks Hall, Morgantown, WV 26506 and GRIMM, Eric C., (Adjunct) Dept Earth & Environmental Studies, University of Minnesota, Minneapolis, MN 55455