“…Hibbard et al (2010) and Hibbard and Karabinos (2013) suggested that this first-order along-strike transition took place near the New York Promontory, where the Devonian clastic wedge is thickest (Faill et al, 1985). Furthermore, there might also be a change of Acadian-Neoacadian subduction polarity near the southern end of the New York Promontory, with the Laurentian margin obliquely subducted beneath the Carolinia in the central and southern Appalachians (Hatcher & Merschat, 2006;Merschat et al, 2023). The lack of significant Acadian crustal shortening and clastic wedge formation in the central and southern Appalachians suggests that accreted terranes were juxtaposed with Laurentia via transpression (e.g., Dennis et al, 2007), without significant crustal shortening perpendicular to the orogen, as shown in Figure 6f.…”