This report deals with the geology of the region about Belton, Montana, which adjoins the southwest corner of Glacier National Park. It includes sections in the valleys of Lake McDonald and the lower twenty-five miles of the Middle Fork of the Flathead River, which cuts across the Belton Hills, Apgar Mountains, Flathead Range and Whitefish-Kootenay Range. The bed rocks are of the Lewis and Galton contemporaneous phases of the Belt Series, and have been faulted into a series of parallel blocks which dip from 20 to 75 degrees to the northeast, and trend north 45 degrees west. Two examples of drainage changes due to glaciation are cited
