CENTEAL AOT) EASTEEN NEVADA. 411 



feet; Telegraph Peak, 9,228 feet; Mokomoke Mountain, 9,239 feet; Treas- 

 ure City, 8,980 feet; Hamilton, 8,003 feet; Shermantown, 7,257 feet; Man- 

 hattan Mill, 7,547 feet. 



Pogonip Pidge towers grandly above the surrounding country. It rises 

 with steep, precipitous slopes, 1,500 feet above Babylon Hill ; while to the 

 west it falls oif in long, rugged spurs, several thousand feet to the valley be- 

 low. Pogonip Mountain commands, upon a bright, clear day, one of the 

 finest and most extended views that can be obtained in this part of the State. 

 The structure of the ridge is quite simple, trending nearly north and south. 

 The geological formation of the eastern slope is composed of a grayish-blue 

 limestone, striking with the trend of the ridge and dipping with an angle of 

 22° to 25° to the east. But few fossils were found, and in a much less per- 

 fect state- of preservation than those of allied forms from the strata of Treas- 

 ure Hill. 



The middle ridge is the most complicated of the three in its geological 

 features, and by far the most important, from its great mineral wealth. The 

 two main features of the structure are, first, a well-marked anticlinal fold, 

 whose axis, although somewhat flexed, has, in general, a north and south 

 direction. Secondly, a transverse fracture and displacement of the rock, which 

 extends across the ridge at the southern end of Treasure Hill. 



The axis of the anticlinal fold follows and forms the canon or ravine sep- 

 arating the Base Metal Pange from the Blue Pidge, then bending around the 

 north end of Telegraph Peak, continues along the east slope of Treasure Hill, 

 600 feet below the summit, through the mining settlement of Pocotillo and 

 the hill upon which the Argyle mine is located. 



This anticlinal fold occurs in limestones, whose western slope constitutes 

 the entire formation of the west side of Treasure Hill and the Base Metal 

 Range, with the exception of some overlying shale and siliceous limestone, 

 which cap the top of Telegraph Peak and the northern slope of Babylon 

 Hill. These westerly dipping beds form, with Pogonip Pidge, a synclinal 

 fold. 



Treasure Hill, from Telegraph Peak to the Eberhardt mine, is about 

 one mile and a quarter in length; across Treasure Peak the width is one 

 mile and three-quarters. To the north it falls off, in a steep, rough slope, to 



