SOUTHERN WASATCH MOUNTAINS, UTAH 439 
The results here presented are essentially a sequel to Black- 
welder’s work. To avoid repetition the evidence will be considered 
by districts rather than according to stratigraphy and structure. 
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Fic. 2.—Geologic map showing the intrusive granite (probably post-Jurassic), 
Cambrian quartzite (-€q), and the great Cambrian to Mississippian limestone belt (/st) 
in the Cottonwood and American Fork—Alpine districts. The width of the narrow 
“lower” limestone belt at Alta is somewhat exaggerated. W=Weber quartzite; Pre-E 
=pre-Cambrian. Topographic base taken from the Salt Lake sheet, United States 
Geological Survey. 
THE COTTONWOOD DISTRICT’ 
Structure.—The arrangement of formations in this district is, 
as shown in Fig. 2, and more completely on the Fortieth Parallel 
1 The term Cottonwood district is here used to include the area around the upper 
parts of Big and Little Cottonwood canyons. 
