BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 21, pp. 517-542, PLS. 36-40 SEPTEMBER 24, 1910 



NEW LIGHT ON THE GEOLOGY OF THE WASATCH 

 MOUNTAINS, UTAH! 



BY ELIOT BLACKWELDER 



{Presented extemporaneously before the Society December 28, 1909) 



CONTENTS 



Page 



Introduction 517 



Stratigraphy 518 



Earlier investigations 518 



Separation of Cambrian from Algonkian 520 



Interpretation of the Algonkian quartzite-slate series 523 



The Ogden quartzite eliminated 526 



The Silurian and Devonian limestones 527 



A non-marine member in the Mississippian limestone. 528 



The red beds near Morgan 529 



The disappearance of the Weber quartzite 530 



Structure 333 



Previous studies 5'33 



Overthrusts in the vicinity of Ogden 534 



Transverse faults 539 



Quaternary faulting 541 



Conclusions 541 



Introduction" 



During the past season the writer, in company with Mr. J. M. Jessiip 

 and Mr. M. A. Becher, from the University of Wisconsin, made a some- 

 what detailed survey of parts of the mountains near Ogden, Utah, and 

 were afforded glimpses of wider range both north and south. This paper 

 will present in a disconnected way some of the more important results of 

 the work. It can not lay claim to being a unified account of the geology 

 of the range, for the opportunities of the party were not such as to permit 

 a sufficiently comprehensive survey. The writer and his companions 



1 Published by permission of tlie Director of the U. S. Geological Survey. 

 Manuscript received by the Secretary of the Society April 19, 1910. 



XXXVII — Bull. Geol. See. Am., Vol. 21, 1909 (517 



