ANTELOPE niLLS AND SCHELL CREEK MOUNTAINS. 48o 



On the south side of the Wachoe Mountains extend flows of r]i3^ohte, form- 

 ing low rolhng hills, which stretch out westward nearly to the centre of 

 Steptoe Valley, and connect at the south with the northern end of the Schell 

 Creek Mountains. In their main features, they resemble the hills already 

 described, but, in detail, have been little studied. 



By reference to the lower section, at the bottom of the geological map, 

 the structure of the Wachoe Mountains will be readily understood. The 

 section is drawn on a- due east and west line. It represents a central granite 

 nucleus, fomiing the higher summits, with Coal-Measure limestones dipping 

 away on both sides. On the eastern side, the limestone is traversed by 

 quartz-porphyry dikes, and still later, on both sides, the palaeozoic beds are 

 concealed beneath the rhyolites, which, flowing out into the valleys, are, in 

 turn, covered by Quaternary deposits. It is worthy of notice that few 

 desert ranges of Eastern Nevada have such abundant springs of fresh 

 water as are found upon the eastern side of the Wachoe Mountains, in the 

 granite, limestone, and Quaternary beds. 



Antelope Hills and Schell Creek Mountains.— Directly south of 

 the Wachoe Mountains is a series of low ridges, forming the junction of 

 the Schell Creek Mountains with the Antelope Hills. x\t their northern 

 end, just north of Leech Spring, rises a low, ridge, formed by westerly- 

 dipping beds of dark gray limestones and siliceous and argillaceous limy 

 shales. To the east of this main ridge, is a second narrow ridge on the 

 very edge of the Gosi-Ute Valley, composed of a core of granite, on which, 

 to the west, rest some beds of limestone, while on the east of the granite is 

 a peculiar series of interstratified beds of white dolomitic marble and flows 

 or dikes of granitic porphyry, in which occur several veins carrying oxide 

 of copper. From the miners who once prospected these veins, this region 

 has received the name of the Kinsley District. The limestone beds of this 

 region have been referred, like those of the Wachoe Mountains, to the 

 Lower Carboniferous group. The association of beds of crystalline dolo- 

 mite and granitic porphyry has been considered to represent the develop- 

 ment of an Archaean body. They strike north and south and dip 25° 

 to the eastward. No less than six distinct beds of granite-porphyry. 



