102 SOUTHWESTERN NEVADA AND EASTERN CALIFORNIA. 
Rose Spring finely bunded, dark-colored silicified limestone similai 
to that of the Southern Klondike hills outcrops, and this, while 
probably Ordovician, may possibly be a Cambrian inlier. 
The rock- of Quartzite Mountain appear to have been laid down 
in a shallow sea. At some periods during the deposition of the lower 
portion the sea received fragmental material, both line and medium 
grained; at others it received but little, in consequence permitting 
the deposition of limestone. The presence of sun cracks indicates 
that at time- the deposits were even above sea level. The main 
quartzite ma-- was deposited in a -hallow sea to which medium to 
coarse fragmental material was rather constantly supplied. 
The rocks beneath lie- quartzite of Quartzite Mountain resemble 
the interbedded quartzites, slaty -hale-, and Limestones which overlie 
the Pogonip Limestone of the Belted Range. In consequence the 
lower rock- of Quartzite Mountain are probably the transitional 
beds of the Pogonip limestone, while the quartzite, notwithstanding 
unusual thicknes Eureka quartzite. 
Lone Mountain l'ii . -A -mall Limestone hill protrudes from 
the Recent detrital deposits 7\ mile- south of east of Rose Sprina 
Mr. T. C. Spaulding coll i cted a specimen which proves to be a graj 
crystalline limestone with numerous calcite vein-. If the structure 
of the Paleozoic rocks extending northward from Quartzite Mountain 
beneath the rhyolite of the Kawich Range continues its easterly dip, 
this limestone lies above the Eureka quartzite and is probably the 
Lone Mountain Limestone of the Eureka section, described by Hague! 
Siebert lake beds < \). — Lying unconformably upon the earlier 
rhyolite and in one case apparently unconformably below the later 
rhyolite are a number of small exposures of rhyolitie sandstona 
usually conglomeratic. These slightly consolidated sandstones are 
white, gray, or greenish in color and are distinctly bedded. Thj 
well-rounded pebbles and bowlders, the larger of which are 1 foot in 
diameter, include Paleozoic quartzites and jasperoids, granites, dio- 
iite porphyry, monzonite porphyry, and the earlier rhyolite. Quarts 
feldspar, and biotite crystals are characteristic, and either explosive 
eruptions of rhyolite occurred during the deposition of these -aud- 
itories or the crystals were derived from rhyolites with incoherent 
groundmasses. The more easterly of the two masses mapped 3 miles 
north of Kawich is a bedded conglomerate cemented by chalcedony. 
The conglomerate is better assorted than (hat of the rlivolitic sand? 
stone and resemble- the well-rounded conglomerates of the Amargos^ 
Range. It is certainly younger than the earlier rhyolite. since it 
carries rhyolite bowlders and is perhaps contemporaneous with the 
Siebert lake bed-. 
Spurr" found similar rhyolitie sandstones <'»<><> feet thick at the 
° Spurr, J. !■:., Bull. U. S. Geol. Survey No. 208, 1903, p. 163. 
