Arnold Hague's 1904 geological survey map of the spectacular Ishawooa Region in the Yellowstone National Park, Wyoming. Centered on Ishawooa Cone, the map covers the Absaroka Range from the Thorofare Plateau and Ash Mountain to North Fork Shoshone River. Throughout countless well known Yellowstone sites are noted, including Shoshone River, Wapiti Ridge, Trident Plateau, and Ishawooa Mesa, as well as various creeks and mountains. The boundary line between Yellowstone National Park and Yellowstone Forest Reserve runs along the length of the map on the extreme left and the top right corner of the map. This particular map was part of Hague's study of the regions unique geology and the related geothermal activity. The map is color coded to identify different geological zones with a detailed key to the right side of the map proper. Published by the United States Geological Survey in 1904.