Bird Woman Falls in Glacier National Park.  This dramatic waterfall owes its unique topography to the work of two alpine glaciers - the large main glacier that created the rounded slopes of the U-shaped valley, and a smaller glacier that did not erode as much material as the larger glacier and produced a hanging valley. The small glacier began in a small cirque and met the larger valley glacier and was unable to continue eroding the valley.   (Photo by Susie Graetz)

University of Montana | Geography Department