Figure 4: Age-elevation transects for (U-Th)/He thermochronologic data.

Error bars denote 2σ analytical uncertainties. (a), (U-Th)/He ages (circles) for transect 1; (b), (U-Th)/He ages (squares) for transect 2; (c), (U-Th)/He ages (diamonds) for transect 3. Filled symbols denote grain replicates included in the mean age determination. Open symbols denote excluded grain ages.