From Ancient Caves of the Great Salt Lake Region, by Julian H. Steward, 1937, and Culture Element Distributions: XXIII Northern and Gosiute Shoshoni, by Julian H. Steward, 1943.

A moccasin was found in a cave at Promontory Point, Box Elder County. (See images below.)

In 1936, Julian H. Steward consulted with various Shoshone, Bannock, and Goshute informants* about this moccasin’s origins.

The informants that were from around Promontory Point (Shoshone from lower Bear River and Cache Valley areas) thought the footgear in question might have been made by neighbors, but perhaps by Promontory Point-area people.

The Skull Valley Goshute informant, a 76-year-old man called “Moody” or Mudiwak, believed it was the same type made by “Weber Ute” people. Mudiwak had been born in eastern Nevada, but raised in Skull Valley with his maternal grandfather.

Weber Utes are referred to as “Salt Lake Valley Shoshoni” in this paper.

*The informants Steward consulted with included people from the Lemhi area, Fort Hall (both Shoshone and Bannock informants), Grouse Creek, Shoshoni from the Bear River and Cache Valley areas, Skull Valley Goshute, and Deep Creek Goshute.

See: PDFs of mentioned papers are here and here.