| This thesis is an analysis of the archaeological assemblage collected at the Sublett Troughs site in southern Idaho during the summer of 2013. Historic period diagnostics were dated to sometime after 1890. There was no evidence of pioneers using a spur of the California Trail, adjacent to the site, known as Hudspeth Cutoff. Prehistoric diagnostics define the range of early human utilization up to 5,000 BP. Trace element analysis of obsidian from the first ten layers of excavation showed that three local sources (Malad, Brown’s Bench, and Walcott) provided 98% of obsidian toolstone at the site. A group of secondary sources, concentrated near Yellowstone, appears in the top six layers of excavation and merit further research. The Sublett Troughs site provides information vital to the study of toolstone utilization by archaic populations in Idaho as a site-specific investigation that shows change over time. |