Fig. 4: Outcome of inversion approach.

Inversion results for a–d Heimefrontfjella and e–h Jutulstraumen. a, e Samples ordered by elevation above sea level (sample labeling at the bottom). b–d and f–h Distributions of derived parameters for accepted models colored by nuclides included in Monte Carlo inversion according to legend in b, b, f ice burial since 1 Ma (%) derived from the glaciation threshold (δ¹⁸O_th), c, g time of entering within 1 m of present-day surface, and d, h erosion since 1 Ma. Acc. accepted models. Note that the accepted models for each inversion sometimes only yield solutions where the modeled nuclide concentrations of the accepted ‘best-fit’ models fall >1–2σ outside of the measured concentrations for one or more nuclides (indicated by color brightness according to legend in b), e.g., BOR01, VK01 (¹⁰Be-²⁶Al-³⁶Cl-²¹Ne).