Exploration party moving up the Sun River valley "in the direction of the pass between the Crown Butte and the Rattlers, prominent landmarks west of Sun River and visible at a great distance." Plate XXIX.
"The altitude of this butte, as determined by barometric measurement, is 281.8 feet above the level of the Shyenne (Cheyenne) River." Named for "an engagement between some half-breeds and Sioux, in which one of the former, by the...