374 DESCKIPTIVE GEOLOGY. 



valley occasional outcrops of the Triassic sandstones and Jurassic limestones 

 are detected under tlie general covering of soil and surface debris. 



Farmington and Webee Region/ — This includes that portion of the 

 range comprised between Emigration Canon and Weber River; it is less 

 high than either of the preceding, and consists of a single ridge, whose 

 eastern slopes drain into the Weber River, while the canons on the western 

 face are not so long nor so deeply cut as in the Cottonwood region. 



In general, its geological structure resembles that of the latter very 

 closely, being that of the same series of sedimentary rocks folding round an 

 Archaean body, their western member having also been cut off by faulting 

 and erosion; owing, however, to the very general covering of the edges of 

 these beds by Cretaceous and Tertiary formations, the line of outcrops has 

 been more difficult to follow, and the details of structure less completely 

 obtained. 



Immediately north of Salt Lake City, the foot-hill line of the Wahsatch 

 extends westward about 4 miles from Camp Douglas, and sweeping round 

 to the northward recurves again to the eastward into Mill Canon, enclosing 

 a broad mountain-projection; the central part of this mass is a high ridge, 

 having a trend of about north 45° east, which consists of strata of Wahsatch 

 limestone overlaid by nearly horizontal beds of Tertiary conglomerate. On 

 the foot-hills north of Camp Douglas, the limestones of the Upper Coal- 

 Measures are found under the red Triassic sandstones of Red Butte Creek, 

 but the underlying Weber Quartzites are mostly masked by the conglom- 

 erate. At the point, near the Hot Springs, the Tertiary beds have been 

 eroded off, and, for a distance of nearly 3 miles to the northward, the ends 

 of a series of limestone strata are exposed, dipping to the southeast at angles 

 varying from 30° to nearly perpendicular. The beds are from a few inches 

 to 5 or 6 feet in thickness, and of color from buff to nearly black, with a 

 prevailing dark hue; they are shattered in every direction by numerous 

 planes of jointing, which, in some places, entirely obliterate the stratifica- 

 tion-lines. A few obscure fossil corals and crinoid stems are the only 

 organic remains that have been found here. Beyond these, to the north, 

 the foot-hills are formed of a zone of quartzite, for the most part covered 



'From field-notes of Clarence King. 



