PALEOZOIC FORMATIONS OF THE PINON EANGB. 553 



dark-blue beds, and from the fact that a similar heavy body of limestone, 

 above the quartzite at Piiion Pass, carries Devonian fossils, it has been re- 

 ferred to the Wahsatch limestone. It must necessarily be either the Wah- 

 satch limestone or the Upper Coal-Measures. The underlying quartzite is 

 neither thick enough nor coarse enough to be referred to the Weber beds, 

 and without doubt it could not be the Ute limestone, when still underlaid by 

 so heavy a body of limestone as that of Raven's Nest Peak. Moreover, the 

 quality of the quartzite separating these two limestone bodies is quite simi 

 lar to that of the Ogden Quartzite, so clearly shown in Ogden Canon, Wah- 

 satch Range. The thickness of 4,000 feet of underlying limestone is not 

 too much for the Silurian and Primordial series; when we recall the thick- 

 ness of the lower limestone, as seen at White Pine Mountains and at Rob- 

 ert's Peak. It is to be regretted that no organic remains were collected, in 

 view of the fact that at Pogonip Mountain large collections of fossils were 

 made throughout the series of nearly 4,000 feet of strata, the greater part 

 of the beds yielding Primordial forms, overlaid by others carrying species 

 identified as belonging to the Quebec formation. 



Lithologically, the upper limestones at Raven's Nest do not resemble 

 those of Moleen Peak, which carry, not far above the base of the series. 

 Upper Coal-Measure fossils, and overlie the pebble-bearing, gritty, heavily- 

 bedded quartzite. The character of this latter formation is maintained in 

 Moleen Canon, and differs entirely from the Ogden Quartzite, which, 

 throughout Central Nevada, is uniformly fine-grained and finely bedded, 

 and carries no conglomerates. 



Underneath the heavy Silurian limestone, and under the thin bed of 

 saccharoidal vitreous quartzite, there occurs a heavy red and chocolate-brown 

 quartzite, which forms the summit of Pinto Peak, retaining its conformity 

 with the overlying series, and on the south edge of the Pinto Peak Ridge 

 approaching a horizontal position. 



These red quartzites to the north of Pinto Peak are underlaid by more 

 or less of mica schists and quartzitic schists, which, from their position, 

 inferior to the Silurian, and from their similarity to the Wahsatch Cam- 

 brian, are referred to the Cambrian age. They are roughly estimated 

 at 5,000 feet in thickness. The section here exposed, therefore, is a conform- 



