Title: Forts, floods, and periglacial features
Subjects: Geology, Floods, Archaeology, History, Periglacial processes, Stratigraphic Geology, Pleistocene Geologic Epoch
Places: Pennsylvania, Pittsburgh Region, Johnstown (Cambria County), Mount Washington (Pittsburgh, Pa.), Youghiogheny River Valley, Pittsburgh (Pa.), Pittsburgh, Mount Washington, United States
Time periods: Pleistocene