Jensen, Samuel J. (Brigham Young University)
Faculty Advisor: Allison, James (Brigham young University, Anthropology)
The development of Portable X-ray Fluorescence (PXRF) technology has allowed researchers to accurately determine the source of obsidian lithic material. The data produced using this method in turn allow researchers to examine the social interactions of prehistoric peoples through analysis of potential spheres of trade or points of contact. Prior researchers have applied PXRF technology to the analysis of obsidian from the Mesa Verde and Northern San Juan regions of the Ancestral Puebloan world respectively. Despite this work, however, there is a conspicuous lack of data from San Juan County, Utah, which lies at the northwestern edge of the Ancestral Puebloan extent and contains a high density of archaeological sites spanning almost the entirety of Ancestral Puebloan occupation in the American Southwest. This paper aims to fill this gap in data so as to make observations about the potential spheres of interaction that existed across time in this region of the Ancestral Puebloan world. Specifically, this research compares obsidian samples from across San Juan County and from sites with different time periods of occupation to reveal potential patterns of obsidian procurement throughout temporal space in San Juan County.