The data above represent substantial agreement with our own findings. Moving from west to east, the Snake River north of its junction with the Powder River (Oregon) is in precipitous canyon country and was no doubt little used. Mixed Shoshone and Mono-Bannock-speaking groups occupied the lower part of the Weiser River, but, as has been here stated, traded with the Nez Perce in the upper part of the valley. Some of the action of the Sheepeaters' War of 1878 took place in the mountains between the middle and south forks of the Salmon River, and there is no evidence of Shoshone use of the country north of the Salmon River. However, other groups apparently reached the Salmon River and its southern tributaries. Ferris met a village of Nez Perce on the Lemhi River in October, 1831 (Ferris, 1940, p. 120), and Wyeth reported a Nez Perce camp on the Salmon River in May 1833 (Wyeth, 1899, p. 194). The Nez Perce were also reported camped on Salmon River waters only one day from Fort Hall in August, 1839 (Farnham, 1906, p. 29). In the northeast corner of the area in question, Lewis and Clark first met the Flathead on the far side of Lost Trail Pass near present-day Sula, Montana, in August, 1805 (Lewis and Clark, 1904-06, 3:52). Shoshone no doubt crossed the pass occasionally and hunted there also, but this encounter and those reported in the preceding references indicate that the northern region of Shoshone nomadic activities was an area frequently entered and used by other peoples. Again, there is no strict boundary, but a zone of interpenetration. THE SHOSHONE OF BANNOCK CREEK AND NORTHERN UTAH There is little historic information on the specific area of Bannock Creek, Idaho. Almost all references to those Shoshone who were later found to have ranged through the area during part of the year is under the heading of Pocatello's band. This band was a hostile group under Chief Pocatello that raided white settlers and emigrants in the late 1850's and early 1860's. Pocatello's followers were mentioned along many points on the Oregon Trail through southern Idaho and were just as frequently reported in Box Elder and Cache counties in northern Utah.