The upright anticline that forms results from an initial fault propagation fold that forms one antilcine limb, followed by collapse of the edge of the hanging wall to produce the other limb. In each case, the normal fault dips less steeply in the weak white layer, causing collapse of the overlying hanging wall and forming an anticline. Here, another week layer within the hanging wall partially “disconnects” the pink and green layers from everything below, allowing them to form very gentle, broad folds above more intensely faulted layers.