538 DBSCEIPTIVB GEOLOGY. 



XVIII is shown one of the deeply-cut glacier-caiions which come down from 

 Clover Peak. 



A little north of where the main South Fork of the Humboldt River 

 flows out of the East Humboldt Range, the Archaean mass makes out in a bold 

 promontory, around whose base is wrapped a series of unconformable over- 

 lying limestones. About a mile and a half north of the South Fork of the 

 Humboldt, these beds have a north and south strike, and dip about 25° to 

 the west. This position is held for nearly 3 miles to the north, when they 

 describe a curve, and finall}^ strike north 40° east, and dip northwest at about 

 20° to 25°. Nearly 4,000 feet of limestone a^e thus exposed, and at their 

 base a varying amount of quartzites. At times, the Archaean comes directly 

 in contact with the limestone, so that the intermediate quartzite, -which has 

 been referred to the Ogden group, is wanting, while in others, there is an 

 exposure of 100 to 200 feet of quartzitic beds. The first 2,000 feet of lime- 

 have prevailing light colors, and among the light-gray beds are many of a 

 buff tone. Above these come the dense blue-black limestones, carrying 

 a number of well-defined Coal-Measure forms, comprising the following- 

 species : 



Productus semireticulatus. 



Productus longispinus. 

 Fusilina cylindrica. 

 Camarophoria. 



From its thickness, the character of the underlying quartzite, the pre- 

 vailing buff hue of the lower members of the series, and the character of the 

 organic remains, there can be no hesitation in referring these beds to the 

 Wahsatch limestone. 



Back of the Overland Ranch, in among the schists and granites, in a 

 canon just to the north of White Cloud Peak, there is a fragment of lime- 

 stone devoid of fossils, and so deeply fractured and metamorphosed as to be 

 little more than an irregular mass of blocks. It is doubtless an accidental 

 fragment left by the general erosion, and indicates the fact that, prior to the 

 u^jheaval, much of the crystalline schists were overlaid by the Wahsatch 

 limestone. Along the foot-hills south of Camp Halleck, occupying a 

 similar position and unconformably overlying the schists, is a little pointed 



