head with the inscription "John Colter" on one side and the year "1808" on the other, was discovered in a field in Tetonia, Idaho, which is west of Teton Pass. The Colter Stone has not been authenticated to have been created by John Colter and may have been the work of later expeditions to the region. John Colter is widely considered the first mountain man and, like those that came to the Jackson Hole region over the next 30 years, he was there primarily for the profitable fur trapping; the region was rich with the highly sought after pelts of beaver and other fur-bearing animals. Between 1810 and 1812, the Astorians traveled through Jackson Hole and crossed Teton Pass as they headed east in 1812. After 1810, American and British fur trading companies were in competition for control of the North American fur trade, and American sovereignty over the region was not secured until the signing of the Oregon Treaty in 1846. One party employed by the British North West Company and led by explorer Donald Mackenzie entered Jackson Hole from the west in 1818 or 1819. The Tetons, as well as the valley west of the Teton Range known today as Pierre's Hole, may have been named by French-speaking Iroquois or French Canadian trappers that were part of Mackenzie's party. Earlier parties had referred to the most prominent peaks of the Teton Range as the Pilot Knobs. The French trappers' les trois tétons (the three breasts) was later shortened to the Tetons. Formed in the mid-1820s, the Rocky Mountain Fur Company partnership included Jedediah Smith, William Sublette, and David Edward Jackson or "Davey Jackson". Jackson oversaw the trapping operations in the Teton region between 1826 and 1830. Sublette named the valley east of the Teton Range "Jackson's Hole" (later simply Jackson Hole) for Davey Jackson. As the demand for beaver fur declined and the various regions of the American West became depleted of beaver due to over trapping, American fur trading companies folded; however, individual mountain men continued to trap beaver in the region until about 1840. From the mid-1840s until 1860, Jackson Hole and the Teton Range were generally devoid of all but the small populations of Native American tribes that had already been there. Most overland human migration routes such as the Oregon and Mormon Trails crossed over South Pass, well to the south of the Teton