This paper presents the results of in-field data analysis of stone artifacts from the surface of 26NY7920, a large WST site near Yucca Mountain on the Nevada Test Site (Fig. 1). Examination of the spatial dispersion of stone artifacts allowed the site to be partitioned into three clusters based upon tool and flake densities from across the site. The kinds of stone artifacts found within the clusters were compared with each other and with the rest of the site assemblage found in a nonclustered context, in order to make inferences regarding the segregation of activities at the site. This analysis included evaluating lithic reduction strategies, stone tool content, and toolstone selectivity.