Figure 9--Line diagram interpretations of cross sections through the models. (a) Double differential load model without inversion. Note the location of the second graben system above the former fold-thrust belt of the initial delta wedge. (b) Double differential load model with inversion. Note that sites of contractional activity during the inversion phase are primarily limited to zones with preexisting structures, i.e., delta-top graben and delta-toe fold-thrust belts.