Chickamin Glacier, on the eastern slopes of Dome Peak (2,723 m). This composite valley glacier (left) and slope glacier (right) demonstrates the variations that can take place even in a single ice mass. The tongue at the left has retreated since observations began in 1955, but the terminus on steep cliffs on the right advanced rapidly in the early 1950's and has remained little changed since then. Glacier Peak Wilderness, Skagit County, Washington. September 23, 1965. Published as plate 3-F in U.S. Geological Survey. Professional paper 705-A. 1971.