Journals of the Lewis and Clark Expedition Online
Geege Schuman stashed this in History
"But the northern Shoshonis were more than ágaideka'a, salmon eaters. In the years after 1700, with the introduction of the horse and contact with plains cultures, there was a revolution in northern Shoshoni life. That social and cultural upheaval turned pedestrian small-game hunters and fishermen into equestrian hunters of the buffalo and antelope. Changes in social values and organization paralleled the economic ones. After 1700 the northern Shoshonis developed a culture more like their plains neighbors than their Great Basin relatives. By regional standards, most northern Shoshonis were not the poverty-striken people portrayed by the captains but rather well-to-do, possessing material goods and horses beyond the imagination of most Great Basin peoples. But the acceptance of the horse and some plains nomad traits did not mean that the old ways disappeared. The two traditions were not mutually exclusive. Lewis and Clark saw a people who scheduled their lives and habits to suit salmon runs west of the divide and buffalo herds east of it. Lewis provided in his journal entries a survey of the material culture of people whose lives were poised between a Great Basin past and a plains present. Skin tepees and brush lodges, salmon weirs and buffalo hunts all pointed to Indians who had achieved a balance in a difficult land."
TL, which makes it a great weekend read.
Lewis & Clark among the Indians
6. Across the Divide by James P. Ronda
"Men with faces pale as ashes"—Shoshoni Oral Tradition