RECONNAISSANCE IN THE SOUTHERN WASATCH 
MOUNTAINS, UTAH" 
G. F. LOUGHLIN 
United States Geological Survey 
CONTENTS 
INTRODUCTION 
Previous work 
THE CoTTONWwoop DISTRICT 
Structure 
Summary of Structural Evidence 
Stratigraphy 
THE AMERICAN FORK-ALPINE DISTRICT 
THE Provo DISTRICT 
THE SANTAQUIN—MouNT NEBO DISTRICT 
Stratigraphy 
Structure 
Overthrusts 
Block faults 
SUMMARY 
INTRODUCTION 
The facts here presented were gathered during a reconnaissance 
of the ore deposits in central Utah for the United States Geological 
Survey during the summer of 1912. No time was available for 
thorough areal work, but certain of the results obtained in the 
southern half of the Wasatch Mountains seem to be of sufficient 
interest for presentation. The districts visited in the Wasatch 
country were the Big and Little Cottonwood districts, where the 
writer accompanied Mr. B. S. Butler of the Survey, the American 
Fork and Alpine districts, the Provo district, and the Santaquin- 
Mount Nebo district (see Fig. 1). 
Previous work.—The only published accounts of previous areal 
work on the bedrock geology of the region are in the report of the 
t Published by permission of the Director of the United States Geological Survey. 
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