UTAH LAKE EEGION. 



343 



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n. 



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 a - 

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a 



P. 



c. 

 u. c. 



L. C. 



s. c. 



D. 

 O. D. 



Ca. 



Upper Coal-Measure 

 Limestone. 



Weber Quartzite . 



Wahsatch Limestone 



Ogden Quartzite. 



Ute Limestone . 



Cambrian 



A group of ripple-marked mud- rocks, with some yel- 

 low limestones and limy shales, underlaid by 

 light-gray and blue limestones, with varying pro- 

 portion of siliceous beds. 



A heavy body of quartzites, white and reddish 

 (stained by oxide of iron), generally much broken, 

 and containing several thin beds of siliceous and 

 argillaceous limestone. 



A thick belt of blue limestones; in the upper part 

 frequently rather thinly bedded, and interstrati- 

 fied with light-colored siliceous beds and quartz- 

 ites; in the main mass compact, heavily bedded, 

 and toward the base again darker colored, more 

 thinly bedded, and with siliceous beds ; Coal- 

 Measure fossils throughout, except in the lower 

 portion, where are found in places !Sub-Carbonifer- 

 ous, Waverly, and Devonian forms. 



A body of white, generally rather saccharoidal, 

 quartzite, having a slight greenish hue, with some 

 associated clay-slates. 



A body of dark, almost black, compact, siliceous 

 limestone, with calcareous shales and argillites 

 toward the base, carrying Quebec fossils at top 

 and bottom. 



Potsdam : A bed of calcareous clay-slates, of vary-^ 

 ing thickness, carrying primordial fossils. 



A great thickness of white quartzites, whose lowest > 

 members are not found. Includes a few mica- 

 ceous beds, and in the lower part black argillites. , 



Feet. 

 2, 500-3, 000 



o, 000-7, 000 



7,000 



1, 000-1, 250 

 1, 000-1, 500 



12, 000 



The Wahsatch Eange may be subdivided topographically, in accord- 

 ance with the different types of geological structure developed, into the fol- 

 lowing general divisions : The Southern Region, that opposite Utah Lake 

 Valley ; the Cottonwood Region, that opposite Jordan Valley ; the Farm- 

 ington and Weber Region, from Salt Lake City to Weber Canon ; and the 

 Northern Region, north of the Weber River. 



Utah Lake Region. — The southern limit of the Wahsatch Range 

 proper is found at Mount Nebo, a sharp jagged peak, 12,000 feet in height, 

 which is situated about south of Utah Lake, and 25 miles beyond the 

 limit of the map. The structure of this peak is that of a sharp anticlinal, 

 in which, contrary to what is the case in the main portion of the range to 

 the northward, the western member is well-developed, and, indeed, forms 

 its principal mass. The axis of the anticlinal is a little to the east of the 

 summit, which is formed of thinly-bedded limestones and limy shales, 



