KAWICH RANGE, SEDIMENTARY ROCKS. 
varieties are greenish on account of the development of secondary 
?ericite. Rarely thin laminae of dark gray or black alternate with the 
white bands. Pure quartzose facies are more abundant than felcl- 
spathic, although well-characterized arkoses also occur. While these 
rocks are largely quartzites some beds are better defined as indurated 
sandstones. The rock is typically fine to medium grained, but con- 
glomerates with well-rounded pebblas one-half inch in diameter also 
jccur. The pebbles include smoky or pinkish quartz, probably of 
granitic origin, pink feldspar, compact red jaspilite, and fine-grained 
:>iotite schist with phenocrystic muscovite crystals one-eighth inch 
ong. These pebbles can not be certainly referred to any Paleozoic 
rocks seen in the area surveyed, although they may possibly be derived 
n part from the Cambrian or from a pre-Cambrian series. The 
juartzite is medium to heavily bedded. Cross-bedding is common and 
•ipple marks are locally well developed, while sun cracks are rare and 
onfined to the finer grained arkoses. The quartzite is well cemented 
nd both pebbles and matrix are cut by numerous quartz veinlets. 
Hie presence of two intersecting systems of quartz veins at an angle 
f 45° to the bedding planes, one set short and rather wide in the plane 
f stretching, the other thin, more numerous, and of greater length 
n the plane of compression, indicates that the quartzite beds have 
uffered considerable shearing. Muscovite films have been developed 
>n some parting planes. Minor faults occur in the quartzite mass and 
n some cases cut the quartz veins. Joints are well developed and in 
onsequence the rock fragments are angular blocks. 
The rugged inlier of quartzite 3 miles north of east of Silverbow is 
urrounded by rhyolite. It is similar lithologically to the purer 
vhite or pinkish-white quartzites of Quartzite Mountain. Thin 
uartz veins with vugs and a few seams of pyrite cut it. The quartz- 
ite area 6 miles west of north of Rose Spring exposes 400 feet of 
imilar quartzite. Conglomeratic bands with white quartz pebbles 
|ne-half inch in diameter are interbedded with the fine-grained bands. 
I The slaty shale of Quartzite Mountain grades on the one hand into 
rgillaceous sandstone and on the other into clayey limestone. The 
hale is fine grained and olive green or dark gray in color, although in 
lare instances bright-green facies occur through the development of 
hlorite. Secondary mica films are common on the shale parting 
llanes. 
| The limestone of the Quartzite Mountain section is a siliceous, 
bmpact, well-bedded rock of medium grain. In color it is yellow or 
eddish yellow. Some beds are oolitic, with white calcite cement 
rhich over areas one-half inch in diameter is of common orientation 
ind reflects light like a single cleavage face. The texture is the 
(oikilitic of igneous rocks. Suture joints occur, but are not char- 
cteristic. In the small area of sedimentary rocks 2 miles east of 
