Figure 3.
Site location of radiocarbon dates in SAAD. All sites are within the contiguous SAAD, the boundary of which is defined using four of the Koppen–Geiger climate classification zones using table 1 from Peel et al. [43]: BWh, arid hot desert, mean annual precipitation (MAP) < 5× Pthreshold, mean annual temperature (MAT) ≥ 18°C; BWk, arid cold desert, MAP < 5× Pthreshold, MAT < 18°C; BSh, arid steppe hot, MAP ≥ 5× Pthreshold, MAT ≥ 18°C; BSk, arid steppe cold MAP ≥ 5× Pthreshold, MAT < 18°C. (Online version in colour.)