First order estimates of source area exhumation rates from detrital apatite and zircon fission-track minimum-age and central-age lag times are derived from the 1-D steady-state thermal advection model age2edot by Brandon (see Ehlers et al., 2005 for details). Model parameters given in the plot are: Ts: surface temperature; Tgrad: thermal gradient; Zlw: crustal thickness; Tlw: temperature at the base of the crust; kappa: thermal diffusivity. The lag time (Myr) is the time difference between the age of deposition and the fission-track age. The black dotted lines show the mean lag-time estimates of the combined AFT and combined ZFT samples. The exhumation rate is estimated from the Y-axis.