Fig. 7

Sensitivity to burial and erosion. Apparent exposure ages of Grub2 calculated for two sets of scenarios. Concentration uncertainties of 6 %, resulting in 8.5 % uncertainties on nuclide ratios, are used for sensitivity statements. A 9.6 ka of exposure followed by a burial period of t_b = 0–1500 years. t_b = 1000 years is identical to scenario B in Figs. 2 and 3. If burial lasts longer than ~500 years, in situ ¹⁴C is expected to yield significantly lower apparent ages than ¹⁰Be or ³⁶Cl. B 9.6 ka of exposure followed by a burial period of 500 years. While buried, the surface is eroded by 0–15 cm by glacial erosion. The starting point at erosion depth = 0 is the same as t_b = 500 years in panel A. If more than ~6 cm are eroded, ³⁶Cl yields significantly higher apparent ages than ¹⁰Be