BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 17, pp. 287-302, PL. 24 JULY 13, 1907 



UINTA MOUNTAINS* 



BY SAMUEL FRANKLIN EMMONS 



{Bead before the Society December 29, 1906) 



CONTENTS 



Pase 

 Introductiou 287 



Topographj' of the region 287 



Purpose of the paper 288 



State of geological knowledge 289 



Methods of work 290 



Major Powell's investigations 292 



Recent investigations 293 



Geology of the region 295 



Structure 299 



Correlation 300 



Origin of Green river 301 



Introduction 



The Uinta mountains form one of the most interesting and unique 

 ranges in the Cordilleran system, in that they have a typical anticlinal 

 structure with east-west axis and show no evidence of igneous action con- 

 nected with their uplift. 



In them are exposed, moreover, the only Paleozoic outcrops arising 

 above the covering of Tertiary sediments in the upper part of the Colo- 

 rado Plateau region, which thus furnish the sole connecting link between 

 the Wasatch uplift on the west and that of the Eocky mountains on the 

 east. 



Topography op the -Ebgion 



Topographically, they form a rather flat elliptical dome about 150 

 miles in length along their main axis and 20 to 25 miles in average 



* For the general location map (plate 24), showing the geographical position of the 

 area discussed, I am indebted to Professor C. P. Berlcey, who used it in his paper, "The 

 Stratigraphy of the Uinta Mountains." Bull. Geol. Soc. Am., vol. 16, 1904, plate 89. 



Manuscript received by the Secretary of the Society May 20, 1907. 



XXV— BuLi,. Geol. Soc. Am., Vol. 18, 1906 (287) 



