Figure 3: Luminescence and radiocarbon dating of burnt Genyornis eggshell.

(a) Cumulative probability age distribution derived by summing the individual OSL Gaussian probability distributions for seven sites with burnt Genyornis eggshell (Table 1). The median age is 47.5 ka, with the light dashed lines representing the 16th and 84th percentiles of the aggregate distribution, similar to ±1σ in a Gaussian distribution. (b) Calibrated age ranges (±1σ) for 11 ¹⁴C dates on unburnt Genyornis eggshell associated with burnt fragments (Table 1), omitting the two dates from Warroora (W, Fig. 1) that are significantly younger than OSL dates from the same sites (no overlap at ±1σ; Table 1). Vertical heavy dashed line represents the age that most closely satisfies the ¹⁴C dates (with one exception), suggesting that burnt Genyornis eggshell is unlikely to be younger than 47.5 ka. Unshaded region in a represents the most likely age range for burnt Genyornis eggshell, although a range including the lightly shaded region cannot be confidently excluded. ¹⁴C dates are plotted with increasing minimum age upward; letters refer to regions located on Fig. 1.