The East Kaibab Monocline has been hollowed out by erosion of North Canyon to allow a intimate view of the nature of monoclinal folds; the upper Paleozoic sedimentary rocks exposed in the upper part of the fold limb are bent downward to the east (just east of the fold axis), are tilted down-to-the-east in the exposed western flank of the hogbacks on the far side of North Canyon, and then flatten back out to the horizontal on the Marble Platform.