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In the far west we have the Shiwits Plateau covered with sheets of lava and volcanic cones; then climbing the Hurricane Ledge we have the Kanab Plateau, on the southwest portion of which the Uinkaret Mountains stand a group of dead volcanoes with many black cinder cones scattered about. It is interesting to know how these mountains are formed.
Its different portions have been named by the people living below as distinct mountains, as Shiwits Mountains, Mogollon Mountains, Pinal Mountains, Sierra Calitro, etc., but they all rise to the summit of the same great plateau region. The upper region, extending to the headwaters of the Grand and Green Rivers, constitutes the great Plateau Province.
Going eastward across the Shiwits Plateau the Hurricane Cliffs are reached, and climbing them we are on the Uinkaret Plateau, which is bounded on the south by the Grand Canyon and on the north by the Vermilion Cliffs, that rise above its northern foot.
These two great beds are separated by 80 miles of comparatively straight river. Let us call this first great bend the Kaibab reach of the canyon, and the straight part the Kanab reach, for the Kanab Creek heads far off in the plateau to the north and joins the Colorado at the beginning of the middle stretch. The third great southern bend is the Shiwits stretch.
Starting at the Grand Wash on the west, the Grand Wash Cliffs, formed by the Grand Wash Fault, are scaled; and if we are but a few miles north of the Grand Canyon we are on the Shiwits Plateau. Its western boundary is the Grand Wash Cliffs, its southern boundary is the Grand Canyon, and its northern boundary is a line of cliffs of degradation, which will be described hereafter.
Thus there are three distinct portions of the Grand Canyon of the Colorado: the Kaibab section, characterized more by its buttes and salients; the Kanab section, characterized by its comparatively straight walls with volcanoes on the brink; and the Shiwits section, which is broken into great terraces with gneiss at the bottom and volcanoes at the top.
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