THE HUKRICANE FAULT. 
113 
plored in detail, and it is premature to attempt any further account of it. 
In the southern wall of the Grand Canon it appears with a displacement of 
about 1,500 feet, throwing down the whole country to the west of it, and 
producing a great clitf of displacement, which vanishes away into indefinite 
distance beyond the river. As we look at it from the northern side it is 
seen that the beds on the side of the downthrow flex downward as they 
approach the fault-plane. This feature is a very common one in the faults 
of the Grand Canon district, and will repeatedly recur as we trace them. 
Its effect just here is to make the displacement at the fault-plane much 
greater than at the distance of a mile or two to the west of it. On the north 
side of the canon the fault appears in still greater magnitude, and also branches 
out into four distinct displacements, appearing at rather small intervals. As 
far north as Mount Logan this multiple character is preserved, but about 4 
miles further north the branches disappeai', and the dislocation becomes a 
single fault, with the edges of the dropped beds turned down. There is a 
slow but steady increase in the amount of displacement as it extends north- 
ward, until about thirty miles north of Logan the increase becomes more 
rapid. As we approach the Virgen River the dislocation becomes very 
great. Upon the sunken side the Permian makes its appearance, then the 
Trias, and finally the Jurassic sandstone, so that near the Virgen we stand 
upon the summit of the Carboniferous on the lifted side of the fault, and look 
down upon the Jura, 1,200 feet below us at the base of the cliff'. Here the 
estimated shear of the fault is about 6,600 feet. North of the Virgen the 
shear increases rapidly, until ten miles north of the Virgen we find the lower 
Eocene on one side and the Carboniferous nearly a thousand feet above the 
Eocene on the other. The displacement here is difficult to estimate with 
accuracy, but it probably exceeds 12,000 feet, and ma)^ attain 14,000 feet. 
In view of the great dimensions here inferred, there is a necessity for 
great care in scrutinizing the facts, and for ascertaining whether there is no 
other interpretation. This conclusion involves the assumption that the 
entire Permian and Mesozoic series, as well as the local Eocene, ai-e pres- 
ent in the stratigraphic column of the thi’own beds. Of this there can be 
little doubt. As we come northward along the fault we ffnd the beds of the 
several groups coming in one after another until we reach the Eocene. In 
8 G- G 
