Among these may be mentioned Amethyst Mountain, Texas; Yellowstone National Park; Delaware Co., Pennsylvania; Haywood Co., North Carolina; Deer Hill, and Stow, Maine.
Very fine obsidians are also obtained in Mexico, at the Yellowstone Park, in New Zealand, Ascension and in the Caucasus.
Vancouver Barracks, east of the city, is an important U.S. military post (established in 1849) and the headquarters of the Military Department of the Columbia (including Washington, Oregon, Idaho, except the part in Yellowstone Park, and Alaska); the military reservation includes some 640 acres.
The main range of the Rockies follows the boundary line between Montana and Idaho west and north-west from Yellowstone Park in Wyoming to Ravalli county, then turns eastnorth-east to Lewis and Clark county, and from there extends' north-north-west into Canada.
The principal rivers east of the Rockies are the Missouri and three of its tributaries; the Yellowstone in the south-east, the Musselshell in the middle, and the Milk in the north.
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