Shimkin (1947_a_, p. 248) notes that this park was one of the "foci" of Shoshone nomadic activity, a place to which Wind River people repaired for summer hunting. Although this is true for later times, it certainly was not so in the pre-reservation period when hunts on the Missouri waters were conducted only for limited periods and in the plains and valleys where buffalo were to be found. Until the late 1860's the Wind River Valley and the Big Horn Basin and Mountains were zones of penetration rather than occupation of the Eastern Shoshone. Another such zone is in the Tetons and Yellowstone. This is confirmed by the journal of Captain Jones, who commented upon the unfamiliarity of his Shoshone guides with the country around Yellowstone Lake (Jones, 1875, p. 23). He wrote (p. 34): ... the Indians have failed to find the trail back to Yellowstone Lake.... The explanation of this is that they are "Plains Indians," and are wholly unaccustomed to travel among forests like these. Later, the exploring party reached the upper Yellowstone River, above the lake, where Jones commented (p. 39): We have now reached a country from which one of our Indians says he knows the way back to Camp Brown by the head of Wind River. He belongs to a band of Shoshones called "Sheepeaters," who have been forced to live for a number of years in the mountains away from the tribe. The Yellowstone area was frequently entered by the Crow and was evidently not a Shoshone hunting territory, except for the Sheepeaters. Jackson Hole is more commonly mentioned by informants as a place of summer hunting activity, but the above information from Jones would suggest that parties entered it from the Green River country rather than from Wind River. The Eastern Shoshone apparently did not move west of the Tetons except when visiting the Shoshone and Bannock of Idaho. It should be mentioned at this point that the Shoshone and Bannock also hunted in the Jackson Hole and Yellowstone country, probably to a greater extent than did the Eastern Shoshone, and the frequent mention of parties of Blackfoot and other hostiles in the country both east and west of the Teton Range indicates that the weaker Shoshone experienced no little danger there. The valley of the Salt River in western Wyoming was used by both Idaho and Wyoming Shoshone. Idaho Shoshone and Bannock frequently entered the valleys of the Green River and its tributaries to hunt antelope in the fall. These people apparently mixed so frequently with the Eastern Shoshone in this area that it is most expedient to differentiate the respective populations according to where they wintered. On the west, Wind River Shoshone informants now make little mention of any use of the Bear River and Bear Lake country, despite the apparent interchangeability of population in the pre-reservation period; again, it must be assumed that informant data does not much antedate the move to Wind River.