Mormon migration passed along the trail in 1847-1849, and in 1853 fifty-five Mormons settled on Green river at the trading post of James Bridger, which they purchased and named Fort Supply.
Almost half a century later, in the winter of 1824-25, James Bridger, a trapper, discovered the Great Salt Lake while seeking the source of the Bear river.
The family is represented in the Lower, or Wasatch, Eocene by Trigonolestes, in the Middle (Bridger) Eocene by Homacodon (Pantolestes), and in the Upper (Uinta) Eocene by Bunomeryx.
The Bridger stage, when deposition was in progress in the -\Vind River basin, north of the mountain of that name, and in the basin of Green river.
Raynolds, of the United States Corps of Topographical Engineers, with full knowledge of Bridger's accounts, was ordered to explore the region in 1859, and yet, chiefly because of the persistent incredulity with which the accounts of the phenomena were received, the region remained practically unknown until 1870.