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FIGURE 1. Map of Thailand showing fossil sites mentioned in the text (star).

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FIGURE 2. Magnetostratigraphic and lithostratigraphic sections of the Khok Sung sand pit, Nakhon Ratchasima Province (modified from Suraprasit et al., 2015).

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FIGURE 3. Khok Sung locality during excavation in 2005 (picture from Y. Chaimanee). The dark grey sediment corresponds to the fossiliferous layer (unit F). The lower part of unit F is below the water and not visible on the picture.

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FIGURE 4. ESR dose response curves obtained for the six tooth enamel samples. The equivalent dose (De) values were obtained by fitting a single saturating exponential (SSE) through the mean ESR intensities derived from the three repeated measurements.

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FIGURE 5. Gamma dose rate distribution derived from the 10,000 random simulations (bin size = 20 µGy/a). Values have been corrected for 30% water content. A local maximum may be observed at 340 ± 42 µGy/a (mean value and associated standard deviation derived from the three highest bars).

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FIGURE 6. Stacked histograms of CSUS-ESR age distributions obtained for each sample.

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FIGURE 7. Age distribution considering all samples but 3548. Two Gaussian functions were fitted through each of the two peaks, resulting in mean values and associated 1 standard deviation of 130 ± 29 ka and 217 ± 36 ka.

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FIGURE 8. Age range of the sites mentioned in the text. Notes: (i) Thum Wiman Nakin site: minimum age constraint for the fossil assemblage; (ii) Tham Prakai Phet site: unpublished preliminary results from an ongoing investigation. MIS data from Lisiecki and Raymo (2005).

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