Fig. 5

a Subduction age versus ocean crust age for the Franciscan Complex. The green dashed line depicts the estimated age of subducted oceanic crust generated at an oceanic spreading center. For this reason, off-axis-generated oceanic crust plots younger than the green dashed line for any given age of subduction. Note that this diagram is a composite for the entire Franciscan Complex and does not address the potential for along-strike variation in the age of oceanic crust subducted. Existing age information (shown in Fig. 3) is insufficient at present to evaluate along-strike variation in age of subducted oceanic crust. Part a revised from Wakabayashi (2015). b Diagram showing the composite tectonic stacking of OPS that resulted from sporadic Franciscan subduction; the age ranges are from “a” and Fig. 3. As above, this is a composite of the Franciscan Complex and this does not represent a single reach along the subduction zone, and thus, it does not include all of the different accreted units. In addition, there are multiple accreted packages shown for which intact basalt and overlying pelagic sedimentary rocks have not been identified or dated. In this diagram, each accreted OPS package is separated by a non-accretionary paleomegathrust and the column height and vertical position is related to age. Accordingly, each column corresponds to an accreted unit between non-accretion megathrusts within a given accreted column stack on Fig. 3 rather than corresponding to an entire column on Fig. 3 . The accreted OPS is imbricated by various faults that accommodated accretionary paleomegathrust zones (Fig. 4), but these are not shown on this figure. c Same OPS units as “b” but scaled to thickness within major imbricates rather than to age. This is not the total thickness of each accreted unit because each accreted unit is thickened as a result of imbricate fault repetition