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Its main feature, the Waterpocket Fold, is a wrinkle in the Earth’s crust known as a monocline.

Such bends are called monoclines, monoclinal folds or flexures, because they present only one fold, or one half of a fold, instead of the two which we see in an arch or trough.

About three or four miles west of this junction the river enters the east slope of the east Kaibab monocline, and here the Grand Cañon begins.

The whole country hereabouts is composed of monoclines, all the crests presenting one long, gentle slope, with rocks dipping with the slope, and one abrupt short slope, cutting the strata.

The roads, for the most part, follow along the edge of these monoclines, making them unusually long, though easy.