Fig. 1. Location distribution of Late Miocene-Early Pleistocene sites

Fig. 2. Comparison of D_E value of 17 enamel samples calculated by three fitting functions

Fig. 3. The Evolution of D_E-SSE values along with the D_max in 17 samples (The D_E-DSE value and associated error (2σ) which under the condition of D_max=50 kGy are shown with a solid and dash line, respectively; Fig.3(a~q) are arranged from high to low according to the D_E-DSE of 17 samples)

Fig. 4. Correlation diagram between the deviation percentage of D_E value of fossil samples and D_max/D_E value (Fig.4(a~q) is arranged in the same order as Fig.3)