442 GA EE LOU GELEN 
Besides these later reverse faults there are still later normal 
faults, some of which parallel the reverse faults and serve further 
to complicate the structure. Only one is indicated in Fig. 3. 
Some of the normal faults are mineralized, but as the writer’s 
four-day visit to the district was almost wholly confined to surface 
work, he cannot consider them further than to state that the few 
veins seen by him, some of which lie along well-defined faults, 
appear to bear a radiating and concentric relation to the granite 
mass. Mapping of all the veins in the district may disprove this 
Flagstaff 
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Fic. 3.—N.E.-S.W. section on the northwest side of Little Cottonwood Canyon, 
northwest of Alta, showing the effect of faulting upon the distribution of the Cambrian 
quartzite and the Cambrian to Mississippian limestones. The east-dipping overthrust 
is the oldest, the west-dipping reverse faults are later and directly related to the intru- 
sive granite shown at the left. The normal fault in the central part is only one of several 
which were not mapped in detail. 
hasty statement. Whether or not there are important faults still 
later than the period of mineralization the writer cannot say. 
It may, however, be well to emphasize the relations of the two 
limestone belts to the distribution of ore bodies. Both belts con- 
tain producing mines, and during the writer’s visit, in July, 1912, 
it is said that certain companies operating in the eastern or “‘upper”’ 
limestone belt were planning to sink to the “‘lower”’ belt in the hope 
of finding new ore bodies. The presence of the overthrust faults, 
as shown in Fig. 3, gives such a plan little hope of success. It 
cannot yet be said just how far the overridden belt extends eastward 
beneath the “upper” quartzite, but it is highly probable that it 
pinches out within a rather short distance. 
