OQUIRRH MOUNTAINS. 445 



north, at a geological horizon of about 2,000 feet higher, are found abun- 

 dant Sub-Carboniferous and Waverly forms.^ 



In the intermediate 2,000 feet, however, no considerable body of 

 quartzite can be recognized which would lithologically correspond to the 

 Ogden Quartzite. The limestones contain numerous siliceous and cherty 

 bands, but do not differ essentially from those of the Wahsatch group. It 

 therefore remains, in some measure, an open question Avhether the Silurian 

 or Ute limestone is represented here, or whether this Cambrian quartzite, 

 with its overlying shales, has been faulted up as a wedge-shaped mass, and 

 the limestone beds here all belong to the Wahsatch limestone. On account 

 of the decomposable nature of the shale bed which overHes the quartzite, 

 it cannot be definitely determined whether, to the north of the fault-line, 

 the overlying limestones are conformable or unconformable with the Cam- 

 brian beds. The dip of the quartzites at the line of fault is only about 10° 

 to the northward. In the Miner's Delight Mine, whose whole ore-body 

 was at first within the shale belt, an incline which has been sunk in a 

 northerly direction, at an angle of about 15°, steepening in depth to about 

 20°, has, at a short distance from the surface, passed out of the shales into 

 solid limestone. The fact that this incline seems to dip steeper than the 

 stratification- planes indicates that the quartzite and shales have been faulted 

 up as a wedge-shaped mass, otherwise it should have passed into quartzite 

 instead of limestone beds. On this supposition, which is the one followed 

 on the map, no lower beds are exposed in this canon, with the exception of 

 those brought up by the fault, than the Devonian limestone underlying the 

 Waverly. 



At the mouth of East Canon, the limestones dip steeply to the west- 

 ward, at an angle of 65°, striking nearly north and south. This dip is 

 continued along the foot-hills of the range to the northward toward Dry 

 Caiion, the next little cafion to the north ; here the strike of the beds curves 

 round somewhat to the east of north, while the dip of the beds shallows to 

 45°. In Dry Canon, a considerable number of fossils of Sub-Carboniferous 



'Dr. 0. A. White describes an Olenellus Gilberti (Potsdam) from Ophir City, and 

 Spirigera obmaxima, Euomphalus luxus, and a Conocardium ? (Sub-Carboniferous) from 

 below Ophir City.— (Wheeler, Expl. W. of 100th Merid., Vol. IV, Part I, 44 and 92 et 



scq.) 



