554 DESCRIPTIVE GEOLOGY. 



able series of about 14,000 feet in thickness, striking north 25° east, at an 

 angle, diagonally to the north and south trend of the range, and composed 

 in an ascending series of the following beds : 



1. Heavy schists, grits, and quartzites (Cambrian) . . , 5,000 feet. 



2. Graj' and bluish-gray limestones (UtePogonip limestone) 3,500 to 4,000 feet. 



3. Fine-grained and finely-laminated quartzites (Ogden Quartzite) . 1,200 feet. 



4. Dark-blue limestone, with interstratified beds, toward the base 



of the series, of cream-colored and whitish limestone (Wah- 



satch limestone) /• ■- 3,500 to 4,000 feet. 



No fossils were found in any of these beds except the crinoidal stems 

 above mentioned, and the reference of their horizons is therefore made 

 entirely from stratigraphical evidence, which, besides the great similarity to 

 other sections, is in this case rendered quite certain by the continuity of the 

 Ogden Quartzite to the southward in the range. It is not considered certain 

 that the whole of the body laid down as Cambrian is really such. There are 

 two zones of quartzite, one of a gray saccharoidal form, the other brownish 

 and distinctly laminated, which, as described, immediately underlie the lower 

 limestone. Underneath these, the mica schists and heavy red quartzites of 

 Pinto Peak may possibly be unconformable with the Cambrian quartzites, 

 and represent an Archaean centre. The relations between the two are 

 obscure, but the observations in the field tended to show that the whole 

 outcrop is, as colored on the map, Cambrian. The lower beds of the lime- 

 stone body, which has been designated on the geological sheet as Silurian, 

 should probably have been referred to the Cambrian, so as to include in the 

 latter formation those strata which contain Primordial forms. 



Trending southwest from Dixie Pass, the Ogden Quartzite becomes the 

 foot-hill rock west of Pinto Peak, and, with slight interruptions where the 

 Tertiary overlies it, may be traced upon a curved line of strike, until, in 

 the region of Willow Creek, it trends south 50° east, and dips southwest. At 

 Willow Creek, the range has developed a complete anticlinal, of which the 

 central part is formed of the lower limestone, which dips at an angle of 

 about 16° to the west and about 20° to the east. This is overlaid on both 

 sides of the range by the Ogden Quartzite, which, farther south, arches over 

 the Ute-Pogonip limestone, and forms the axis of the fold, overlaid again on 

 each side by the Nevada Devonian, or lower members of the Wahsatch lime- 



