ESR dating of Khok Sung site: Tables

TABLE 1. List of the Khok Sung vertebrate fauna [after Claude et al. (2011), Martin et al. (2012), Suraprasit et al. (2015, 2016)].

TABLE 2. Details of the five fossil teeth collected from unit F for ESR dating purpose.

TABLE 3. ESR results derived from the dating analyses of the six tooth samples. Note that samples 3546A and 3546B belong to the same tooth. Measurement precision is expressed as the mean coefficient of variation of the ESR intensities derived from all the aliquots of a given sample after the three repeated measurements. D_e precision is the variability of the D_e values derived from the repeated measurements of a given sample. The final D_e error is a combination of the fitting error (see Figure 4) and the error on the calibration of the irradiation source (2.3%).

TABLE 4. Radioelement concentrations obtained from the ICP-MS analyses of several samples taken from the raw sediment of unit F and from the crust attached to the fossil bones. Minimum, maximum and mean values and associated one standard error are displayed. The corresponding coefficients of variation are displayed in parenthesis.

TABLE 5. Data inputs for the combined US-ESR age calculations. Note that samples 3546A and 3546B belong to the same tooth. Apparent U-series ages with 2-σ errors are also provided in italics. Key: n/a = not applicable; (1) after Grün and Katzenberger-Apel (1994); (2) A 10% error was assumed; (3) assumed value (note the impact of this parameter is minimum: by considering removed thicknesses of between 20 and 60 µm, the resulting age varies by <1%); (4) used for beta dose rate evaluation only: these values correspond to 75% of the mean concentrations obtained from the crust samples and 25% of the mean concentrations derived from the sediment samples. All errors are given at a 1-σ confidence level.

TABLE 6. Data outputs from the combined US-ESR age calculations. Note that samples 3546A and 3546B belong to the same tooth. Scenario A corresponds to the use of a gamma dose rate of 658 ± 160 µGy/a, while scenario B is based on 342 ± 63 µGy/a instead. Key: p-enamel, p-tissue1 (dentine) and p-tissue2 correspond to the uptake parameter values calculated for each dental tissue as in Grün et al. (1988). Post-Rn equilibrium was assumed in dental tissues and sediment. All errors are given at a 1σ confidence level.