334 MINING INDUSTEY. 



and a dip of about 30° to the northwest. Above the granite the gorge . 

 spreads out into an open longitudinal valley, in whose bottom are exposed the 

 upturned edges of the metamorphic strata, which rest on the granite. 



South of Greneva Canon commences the main high ridge of the Toyabe 

 Eange, which rises suddenly in Geneva Peak to a height of 5,400 feet 

 above the valley. The granite forms only the northern point of this ridge, 

 extending along under its eastern edge, while the summit is formed of slates 

 resting upon it. Greneva Peak consists of limestone shales, striking a little 

 east of north and dipping south at a low angle. From here south as far as 

 Bunker Hill, the main crest of the range is a high sharp ridge of various ar- 

 gillaceous and limestone shales, whose dip changes to the eastward a short 

 distance south of Geneva Peak. The western slopes toward the interior val- 

 leys are generally quite abrupt, though owing to the fragile character of the 

 rocks they are so covered with debris and soil that the details of structure are 

 not very apparent. 



On the eastern foot-hills the slates come in south of Geneva Canon, having 

 a northeast strike, and dip to the east and south, resting on the granite, and 

 extending higher up into the range as one goes south ; these are overtopped 

 by a body of limestone, which first makes its appearance at Tar Creek, and 

 is found in varying thickness along the eastern flanks of the range as far as 

 Kingston. This limestone is a dark-blue, semi-crystalline mass, more or less 

 metamorphosed throughout, and in many places assuming a foliated structure, 

 so that it is difficult to determine the line of division between it and the slates. 

 While the main ridge forms the eastern edge of the general anticlinal fold, 

 there seems to have been a lateral fold between Globe Canon and Santa F^, 

 and the strata are found to be much contorted and disturbed in this region. 

 Near the mouth of Globe Canon the limestone strata have a quite regular dip 

 of 40° to the east, on the north side, striking north and south, those on the 

 south side being irregular and much contorted, while still further south in 

 Santa Fd they are tilted up at a generally steeper angle and have various 

 strikes. On the eastern slope of Globe Peak, which attains the already very 

 considerable height of 11,237 feet above sea level, are a succession of fissile 

 slates of various green and purple shades, including a variety of quartzose 

 mica-schist, containing, however, but a small proportion of mica, which un- 



