Why Did Monongahela Indians Disappear From Western Pennsylvania? Massive Droughts May Be Answer to Mystery, Says Anthropologist at Carnegie Museum of Natural History Story Filed: Wednesday, October 02, 2002 10:31 PM EST PITTSBURGH, Oct 01, 2002 (ASCRIBE NEWS via COMTEX) -- For decades, anthropologists have struggled to explain why the once thriving Monongahela Indian culture disappeared from southwestern Pennsylvania by 1635 - well in advance of European settlement. Jim Richardson, Curator of Anthropology at Carnegie Museum of Natural History, believes he may finally have the answer. In a study published in the journal Archaeology of Eastern North America, Richardson and...