108 
SOUTHWESTERN NEVADA AND EASTERN CALIFORNIA. 
STRUCTURE. 
The Paleozoic rocks are complexly folded (see fig. 8). The Quartz- 
ite Mountain section is a north-south monocline with dips of 10° to 
80° E. The Paleozoic rocks on the west side of the Belted Range 
dip to the cast, and the Kawich Valley probably overlies a gentle 
syncline, although the structure may be much more complex. The ver- 
tical strata of the inlier 3 miles north of east of Silverbow strike cast 
and west. The quartzite 6 miles west of north of Rose Spring strikes 
N'. 75° W. and dips 45° S. Zones of brecciation, indicating that this 
pre-Tertiary folding was accompanied with some faulting, are not un- 
usual. The presence in the volcanic rocks of Paleozoic inliers proves 
that prior to the inauguration of the Tertiary volcanism the Pale- 
ozoic rocks of the Kawich Range had a diversified topography. The 
mountain range then may have been as rugged as now, since the val- 
leys on either side were doubtless at lower levels than at present. 
It is unknown whether or not the normal faults in the monzonite' 
porphyry at Kawich. which are in part older and in part younger 
than the ore deposits, were formed prior to the outflow of the rhyolite. 
550CH 
2 miles 
Fir,. 8.- -Easl wesl section across Kawich Range 2£ miles north of Kawich. 
The rhyolite series north of Rose Spring i^ a monocline with nortlfl 
south strike and low easterly dip. Minor folds of similar strike are 
superimposed upon the monocline. At the detrital gap the strike 
changes to northwest with a dip of 10° to ^0° NE. This uplift 
occurred after the deposition of the Siebert lake beds, since they lie 
on the very crest of the range. Joints were developed in the rhyolite 
contemporaneously with the folding. Sheeting parallel to the folds 
is rather characteristic, although cross joints occur. After the out] 
How of the basalt the range was uplifted, as is shown by the fact that 
the flows southeast of Quartzite Mountain have a decided dip to the 
east. An undetermined amount of normal faulting accompanied the 
post-rhyolitic elevation, and in certain areas, notably in the shales 
associated with the rhyolite H miles east of Rose Spring, the faulting 
is very complex. 
ECONOMIC GEOLOGY. 
Mining activity 
m the Kawich Rang* 
camps — Silverbow, Kawich. and Eden 
Blakes Cam}) and Southern Kawich. 
centers in three major 
md in two minor camps — 
