452 DESCRIPTIVE GEOLOGY. 



resembles very closely that seen on the northwest face of Twin Peak. It is 

 a fine-grained, grayish rock, containing black and bronze-colored mica and 

 dark-green hornblende, in a fine-grained groundmass, made up largely of 

 quartz and plagioclase-feldspar. The microscope discloses the presence of 

 apatite, and the fact that the laminee of mica are very much broken. This 

 dike has a g-eneral northwest trend with the strike of the beds. The sides of 

 Bingham Canon, for a distance of several miles from its mouth, show the 

 remains of gravel-terraces, made up of qiiartzite debris, which extend 50 to 

 100 feet above the bottom of the cailon, and show that, as in the canons of 

 the Wahsatch, the waters of the ancient lake formerly extended up into this 

 canon also. It was the finding of gold in these gravels that first directed 

 the attention of the miners to the ore-beds in these mountains. In the 

 quartzites of Bingham Canon, Mr. J. E. Clayton succeeded in finding some 

 fossil remains, among which have been recognized 



Archceocidaris, new sp,, 

 Martinia lineata, 

 Pohjpora, 



and columns of Crinoids. The sharp synclinal fold on the eastern foot-hills 

 is continued to the north of Bingham Canon, and, at the eastern base of 

 Connor Peak, quartzites are found striking north 15° east, and dipping 

 about 25° to the westward. Some of the more thinly-bedded of these 

 quartzites, of a compact cherty texture, show the effects of compression in 

 the wavy undulating surface of the thinner sheets. Above these are red- 

 dish and yellowish limy shales, overlaid by blue siliceous limestones, while 

 the summit of the peak is occupied by beds of soft, earthy, blue limestone, 

 in which were found Spirifer and Productus, but too poor for specific deter- 

 mination. The dip of these upper beds is to the north and east. As palseon- 

 tological evidence in this region oflfers no means of distinguishing between 

 the limestone of the Upper and Lower Coal-Measures, this body has been 

 ascribed to the Upper Coal-Measure group on purely stratigraphical reasons, 

 from the fact that the quartzites of Bingham Canon apparently dip undei: 

 the mass of Connor Peak. 



