14 



GEOLOGICAL SURVEY OF THE TERRITORIES. 



forces that elevated the entire range. These mountains appear to the 

 eye, in viewing them from the valley, as if they had been thrust up out 



of the plains. The 

 sides are very abrupt, 

 in many instances va- 

 rying but little from a 

 vertical. So far as I 

 could study them, 

 north of Ogden they 

 form a monoclinal, the 

 eastern side shown in 

 its full development, 

 and all the rocks having 

 a general dip to the 

 east, or nearly so. The 

 ff abruptness or steep- 

 ness of the west side 

 f toward the lake is un- 

 I doubtedly due to this 

 fact, as the outcrop- 

 ping edges of the stratai 

 are clearly shown on 

 the side toward the 

 lake, while to the east- 

 ward the ridges of up- 

 heaval extend for miles, 

 gradually sloping to 

 the plains. Whether 

 the west portion was 

 ever elevated or has 

 been removed by ero- 

 sion is not clearly re- 

 vealed. This problem 

 will be discussed at 

 another time. Where 

 the Weber Ei ver passes 

 through the Wahsatch 

 Mountains a nucleus of 

 gneiss is exposed, but 

 in this portion of the 

 range the granitic or 

 gneissic rock is exposed 

 only in a few localities, 

 and then only to a lim- 

 ited extent. These 

 examples are suffi- 

 cient to show that the 

 quartzites, limestones, 

 and other sedimentary 

 rocks above rest upon 

 what we have regarded 

 as well-defined meta- 

 morphic rocks similar 

 Oii;^' to the nuclei of other 

 mountain ranges. A few instances occur of igneous outbursts, like 

 those in the southern extension of the Wahsatch Mountains, but very 



