DAVIS: THE PLATEAU PROVINCE OF UTAH AND ARIZONA. 5 
the faults, and the possible continuity of faults across intervals where no 
break occurs in the topography have therefore an important bearing on 
the physical history of the region. -The following account of certain 
significant localities on the line of the Sevier-Toroweap fault proceeds 
from north to south. 
Tue Fautt at Upper Kanan. — The district that includes the head- 
waters of the Sevier, the Virgin, and the Kanab, on the Kanab (Utah) 
Sheet, U. 8. Geological Survey topographical maps, is of monoclinal 
structure with gentle eastward dip, in which the Sevier fault, Figure 
2, uplifts the eastern half with a heave of nearly one thousand feet 
(Dutton, a, p. 31). The youngest of the dislocated strata are the 
Paunsagunt Tertiaries, which are classed as Eocene. Whether the fault 
occurred early or late in post-Eocene time can be best determined by 
inquiring into the changes effected by general erosion in the topography 
consequent upon faulting. 
Figure 2. 
General cross-section at Upper Kanab. 
The most manifest effects of this fanlt upon local drainage would 
have been to produce longitudinal consequent streams in the trough 
parallel to and somewhat west of the fault line, and short consequent 
streams flowing west and eastward from the divide, as indicated by the 
dotted profile of Figure 2. The upper waters of the Sevier and of the 
Virgin may be in some way related to the inferred longitudinal conse- 
quent streams west of the fault, but the consequent divide east of the 
fault is now replaced by the subsequent valley of the Upper Kanab 
creek, eroded on the weak Cretaceous strata east of the fault and close 
along the line that should have initially stood at the greatest height. 
The simplest explanation for such a valley involves two cycles of ero- 
sion, separated by a regional uplift without significant renewal of fault- 
ing. During the first cycle it may be supposed that the cliff-making 
Paunsagunt strata were worn a few miles back (eastward) from the 
