Fig. 5: Results of landscape evolution models illustrating the decay of relief over ~55 Ma.

a Initial relief is 3000 m at 0 Ma. b Topographic relief is reduced to a regional low-relief topographic surface (< 1000 m) after 55 Ma. c Modelled change in elevation along the longitudinal profile of the trunk river from the continental interior to base level at 0 Ma, 10 Ma, 20 Ma and 55 Ma. Model parameters are given in Supplementary Table 2.