 | Cretaceous; Faulting; Flatiron; Folding; Folds; Hogbacks; Laramide Orogeny; Monoclines; Mountains; Permian; Plate Tectonics; Ranges; Ridges; Sedimentary Rocks; Waterpocket Fold | Flatirons at Capitol Reef National Park. A flatiron is one of a series of short, triangular hogbacks forming a supr or ridge on the flank of a mountain, having a narrow apex and broad base. View Geological Time Scale for this image. |