424 J. W. Powell—Types of Orographie Structure. 
area above, or depress it below, the adjacent country, or not to 
change its relative altitude. These features are exhibited ona 
small scale within a limited area, usually so elongated as to be 
termed a zone. 
During the past season Mr. G. K. Gilbert has studied an area 
where this diverse displacement is by faulting, and the faults 
are of no great inagnitude, and the blocks into which the area 
has been severed are either not tilted or but slightly so. This 
presents the simplest illustration of this type that has yet been 
discovered. It is simply the Kaibab structure on a very small 
scale. Fig. 4 is a bird’s eye view of the blocks mentioned. In 
Fie. 6.—Types of Displacement. 
C.—Kaibab displacement. 
D.—Basin Range displacement. 
E.—Zone of Diverse displacement. 
the section, in the foreground, the heavy line represents the 
summit of the highest Cretaceous group. Fig. 5 is a diagram 
of the same region showing the blocks into which it 1s severed, 
and the same restored to the condition they would have, had 
there been no denudation. 
On the south side of the Uinta Mountains, and east of the 
Green River, another comparatively simple area has ! 
studied by myself. This zone of diverse displacement ers 
the flank of the great Uinta upheaval. These displacements 
are chiefly by flexures rather than by faults, and the blocks are 
more tilted and contorted than in the last. 
