PARKS CLINT MENTING: DISTRICT UTA 437 
The ages and relationships of some of these masses have not yet been 
completely established. 
Structurally the Wasatch Range is a composite, orographic unit. 
In the largest conception, it is a linear north-south anticlinal range, 
truncated on the west and probably south by great faults. This major 
structure is made up of four parts: (1) the Logan syncline, pitching 
north; (2) the eastern limb of an anticline, constituting the western rim 
ofa Tertiary basin; (3) in the middle part (@) a narrow easterly-westerly 
syncline and (0) an easterly-westerly anticlinal dome; (4) to the south 
the eastern limb of a north-south syncline, probably truncated south 
of Mount Nebo by a great northeast-southwest fault, with the down- 
throw on the southeast. These larger structures are exceedingly 
complicated by several systems of intricate faulting. 
The greatest geological activity in the Wasatch Range was in the 
middle portion at its junction with the great east-west Uinta Range. 
Extensive and irregular intrusion, widespread extrusion, thorough 
contact metamorphism, persistent and recurrent faulting, and glacia- 
tion have produced in a comparatively small area highly varied and 
complex geology. At the heart of the area in the focus of these 
combined factors have been formed the most extensive and richest ore 
bodies in the range. 
This limited area, about 24 square miles, is known as the Park 
City District. It lies about 38 miles southeast from Salt Lake City, 
and embraces in its southwest corner the main divide of the Wasatch 
(Clayton Peak, 10,728 feet), and a prominent spur descending east- 
ward 4 to 5 miles to high-lying interior valleys. The spur separates 
the area into three natural topographic divisions, which accord with 
the rock and structural divisions—namely, the north and northwestern 
slopes, the eastern slopes, and the southern. In the northern and 
northwestern portions the complete sedimentary sequence is present, 
dipping universally to the northwest at a moderate angle. On the 
eastern slope the same formations occur (with noteworthy variations), 
dipping in general easterly, much faulted, and intruded by irregular 
stocks and dikes, and on the northeast partly buried by an extrusive 
mass. ‘The southern portion embraces the great laccolithic stock of 
diorite in Clayton Peak on the southwest; dikes and stocks of andesite 
porphyry cutting upward into the overlying sedimentary formations; 
