BELTED RANGE, SEDIMENTARY ROCKS. 121 
bands of shale are included in the sandstone, as well as sandstone in 
the shale member. 
The reddish or brownish sandstone is either a quartzose rock or an 
arkose of medium grain. It is somewhat indurated, but when crushed 
fracture occurs around the grains rather than through them, as in 
quartzite. The indurated sandstone grades into conglomeratic bands 
which contain well-rounded pebbles up to 4 inches in diameter. These 
pebbles are smoky quartz of vein or pegmatitic origin, gray banded 
flint, pinkish or white quartzite. and black jasperoid seamed with 
quartz veinlets. The quartzite and jasperoid closely resemble the 
Cambrian rocks of other portions of the area, and if such is their age, 
it indicates that between the deposition of the Cambrian and the Car- 
boniferous sediments a period of deformation intervened. The meta- 
morphism of these supposed Cambrian pebbles is such that the beds 
from which they were derived must have been folded and eroded prior 
to the deposition of the Carboniferous strata. The arkose grades into 
thin-bedded shale of olive-green, brown, purple, or light-gray color. 
The Weber conglomerate appears to lie conformably beneath the 
Pennsylvanian limestone, and hence occupies a position similar to that 
of the Weber conglomerate at Eureka, Xev.. as described by Hague.'' 
Near Whiterock Spring some peculiar fucoid-like markings occur on 
ight-gray shale. Mr. E. O. Ulrich states that these resemble 
ala odictyon and are probably of Carboniferous age. 
Pennsylvanian limestone. — Pennsylvanian limestone forms the 
rominent ridges north of Oak Spring and the low ridges south of the 
ame point. It also covers considerable areas to the east and northeast 
f Tippipah Spring. Approximately 2.500 feet of this limestone is 
Exposed in the Belted Range, although the top of the formation is not 
present. It is a fine- to medium-grained gray limestone of dense tex- 
ture. Certain layers in fineness of grain and density resemble litho- 
graphic limestone. Much of it is magnesian, and other portions 
[when struck with the hammer smell oily. Small black flint nod ides 
ccur in some beds, and white calcite veinlets are locally abundant. 
he limestone is for the most part rather heavily bedded, although 
nterbedded shaly layers are fine bedded. 
| Intra formational conglomerates occur at several horizons, and near 
the center of the section as exposed is 55 feet of limestone conglomerate. 
The included pebbles, which reach a maximum diameter of 4 inches. 
ire jasperoid and quartzite, probably of Cambrian age, and limestone. 
probably from the lower part of the Pennsylvanian section. It seems 
jikely that this conglomerate merely indicates shallow-water condi- 
ions and not an important stratigraphic break, since Pennsylvanian 
Possils occur above and below it. Above this bed numerous thin layers 
f similar conglomerate and shale an 1 interbedded with the limestone. 
"Hague, Arnold, Mon. U. S. Geol. Survey, vol. 20, 1892, pp. 91-92. 
