ANALOGY WITH THE HURRICANE FAULT. 63 



fold on the line of the fault that had a downward curvature to the east. 

 The fault subsequently broke the fold and carried a portion of it down to 

 the west. This satisfactorily explains the position of the strata on the west 

 side of the fault ; but another explanation is demanded for the eastern up- 

 turning and the reversal of the strata on the east of the fault. This is found 

 in the data given for comparison, by the position of the strata in the sections 

 of the Butte fault (figures 5 and 11). Figure 10 illustrates the position of 

 the strata at the time of the monocline, of which Captain Dutton speaks ; 

 it being understood that the relative position of the strata in the two sections 

 and not the same geologic terranes are referred to. In sections 5 and 11 the 

 monocline is broken and the strata on the east dragged up towards the fault. 

 This is the position which I think the strata on the opposite sides of the 

 Hurricane fault, north of the site of the present town of Kanarra, occupied 

 before the reverse movement, accompanied by the downthrow to the west, 

 began. Erosion removed some of the upper strata, in all probability, but 

 the general section would have been similar to section 10, the dotted lines 

 representing strata present and not eroded as in the section of the Butte 

 fault. The evidence of lateral and vertical pressure on the upturned beds, 

 is the same as on the Butte fault. The subsequent downward movement on 

 the west, or the more probable elevation on the east, was unaccompanied by 

 sufficient lateral pressure to flex and reverse the position of the strata on 

 the east side of the fault, in the vicinity of Kanarra. 



Paleozoic Movement. — Before giving a summary of the history of the East 

 Kaibab displacement, as interpreted in this paper, it is necessary to record 

 the observations upon which the existence of a movement at the close of 

 Paleozoic time is based. 



West of the town of Paria, on the road leading from Paria, Utah, to House 

 Rock spring, Arizona, the upper beds of the Permian rise with the curva- 

 ture of the East Kaibab fold towards the west. The overlying Shinarump 

 conglomerate, the base of the Mesozoic groups, also rises, but not so rapidly, 

 and consequently thins out against the greater curve of the Permian. This 

 is still better seen in a section through the fold exposed by an east and west 

 canon. Erosion, at the close of the Paleozoic, cut into the Permian and 

 formed an eastward-facing cliff. The Shinarump conglomerate was subse- 

 quently deposited against and over this cliff, gradually thinning out to the 

 westward and disappearing against the rising slope of the Permian beds. 

 The cliff and the thinning out of the Shinarump are well shown in the section 

 forming fi^. 12. 



The Shinarump does not appear again iu the entire distance across the 

 Kaibab fold. The massive upper stratum of brown sandstone capping the 

 Permian is also absent, and the clays of the Permian and Trias are in con- 

 formable contact, no evidence of a stratigraphic break being discernable. 

 From the fact that the massive upper stratum of the Permian also thins out 



