Montana And Wyoming Territories. Embracing most of the country drained by the Madison, Gallatin And Upper Yellowstone Rivers. Department Of The Interior U.S. Geological Survey Of The Territories. F.V. Hayden, U.S. Geologist In Charge. Geology By F.V. Hayden, Assisted By A.C. Reale, Drawn By Henry Gannett, From Notes And Sketches By Adolf Burck, Chief Topographer Of The Yellowstone Division. J. Bien, Lith