184 GUIDEBOOK OF THE WESTERN UNITED STATES 
It is believed that the steep southern and western sides of the 
Santa Catalina Mountains are determined by a great fault, for the 
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| _ Figure 47.—Geologic map and crosssections in the vicinity of Colossal Cave, 3 miles east of Vail, Ariz. 
_ Strongly marked bedded structure of the schists dipping to the west 
= tly cut off on those sides, The upper part of the range 
