HUNTINGTON AND GOLDTHWAIT: THE HURRICANE FAULT. 207 
At the top of the Painted Desert series, as we have limited it, and at 
the base of the Kanab, there is a thick sandstone member, of a lavender 
or mauve color, and of such hardness that it often forms a bench above 
the shales, after the manner of the Shinarump, though hardly so con- 
spicuously. In Plate 1 A this bench-maker can be seen, near the base 
of the lofty Temples of the Virgin. Plate 2 A shows it again, this time at 
Dry canyon, where as a result of tilting it forms a cuesta parallel to the 
Shinarump ridge, and just east of it. 
Above the mauve sandstone, at the base of the Kanab, is a thin series 
of weak beds, whose non-resistance permits the development of the plat- 
form beneath ; then comes about seventeen hundred feet of uniformly 
hard brick-red sandstone, occasionally cross-bedded. It is the unusual 
thickness and massiveness of this hard sandstone formation that makes 
it the greatest cliff-builder in the region. As the northwestern portion 
of the Vermilion cliffs, it runs just outside the limits of our map; for 
although at Rockville its imposing front trends towards Toquerville, it 
turns rather sharply, a few miles east of LeVerkin creek, and runs 
northwest to Colob. The architecture of the Kanab is massive and 
grand. Lofty though the red cliffs really are, their height is even 
exaggerated, as a result of prominent vertical jointing, by deep rifts 
which cut the cliffs from top to bottom. Below, the rifts show as 
sharp upright slits through the rock, but at the top they widen out 
into ragged gashes, chopping up the rock into pinnacles and spires 
(Plates 1 B, 4 B). 
Within the limits of our map the Kanab does not attain this 
grandeur of form. Only along the eastern base of the Pine Valley 
mountains is the entire formation eaposed ; and there it has an ancient 
subdued topography that has had little chance for reconstruction through 
a renewal of slopes, as will be shown later. 
The Colob formation, also, in the vicinity of Toquerville, is not dis- 
played to best advantage. Along the Pine Valley range it forms 
rounded foot-hills and long sloping ridges, which have little individuality, 
aside from their pure white or occasional butf color. Far to the east- 
ward, at the Temples of the Virgin, and along the marvellous White 
cliffs, the more magnificent features of sculpture are brought out by 
active erosion (Plate 4 A). Even in our region, however, where recent 
erosion has been actively at work, the structural detail of the Colob is 
well shown, in long sweeping curves of cross-bedding. The slow crum- 
