Figure 4. Compilations of magmatic ages in four main time periods. The trench is moved to the position of each time period’s outboard terrane. Within each time period, data points are plotted with color representing age, at the sampled location. Samples with ages from previous periods are in gray. (a-d) Bedrock ages. (e-h) Detrital ages. (a)&(e) Modern Yakutat slab dominated configuration (30-0 Ma). (b)&(f) Pacific dominated subduction configuration (50-30 Ma). (c)&(g) Slab window configuration, after Kula plate breakoff (60-50 Ma). (d)&(h) Kula subduction configuration (100-60 Ma). TiF–Tintina Fault, DF–Denali Fault, HCF–Hines Creek Fault, TaF–Talkeetna Fault, LCF–Lake Clark Fault, ToF–Totschunda Fault, DRF–Duke River Fault, BRF–Border Ranges Fault, CF–Contact Fault, CSF–Chugach-St. Elias Fault, TrF–Transition Fault. Data available in tables S1, S2, S3 and S4. For the Western and Central Alaska Range Arcs the 50-30 Ma divison is 50-25 Ma because magmatism continues for 5 Ma after the arrival of the Yakutat slab.