Figure 2. Latitude vs Age and Longitude vs Age for bedrock samples <100 ca. Ma from the Western (a, d)) and Central Alaska Range Arc (b,e) and the Talkeetna Mountains (c,f). Wrangell Arc not show because of a complicated history involving slab edge droop and dissection by the Totschunda Fault. See the text and Trop et al., 2022 for a detailed reconstruction of the Wrangell Arc spatial variation. Yellow swath highlights the shift in magmatism ca, 87 Ma to 75 Ma to south for the Western Alaska Range and the Talkeetna Mountains and the gap in magmatism in the Central Alaska Range. S:south; N: north; E:east; W: west. Data in tables S1, S2, S3, and S4.