Figure 4

Expected local (a) strontium ratios*1 and (b) oxygen values*2 from water sources in the Cape region of South Africa, as referenced in this research to develop expected local ranges. *1Image (a) Schematic geological map representing archaeological fauna and human Sr values from Sealy et al.21, Balasse et al.30, and Radloff et al.31. Image modified from Kootker et al.34; Fig. 2. Schematic geological map of the southwestern Cape. *2Image (b) Modified image from West et al.20 isoscape, developed with geospatial and oxygen data.