8 CONTENTS. 
Descriptive geology — Continued. Page. 
Ranges north of Palmte Mesa— Con tinned. 
Belted Range — Continued. 
General geology — Continued. 
Igneous rocks — Continued. 
Earlier rhyolite 125 
Later rhyolite 127 
Basalt 127 
Structure 128 
Economic geology 128 
Oak Spring___ 128 
Other areas 130 
Pahute Mesa 131 
Topography and geography 131 
General geology 131 
Metamorphic rocks J 132 
Mica schists 132 
Sedimentary rocks 132 
Paleozoic quart/ate 132 
Sieberl lake beds 132 
Later tuffs 132 
Uecent desert gravels 138 
Igneous rocks 133 
Pre-granite monzonite 133 
Post-Jurassic granite 133 
Earliest rhyolite 135 
Biotite andesite 135 
Middle rhyolite 136 
Latesl rhyolite 13(5 
Basalt 137 
Structure 137 
Economic geology 137 
Trappmans < "amp 138 
Wilsons Camp 139 
Gold (/rater 130 
Other areas 140 
Tolicha Peak and Quartz Mountain 141 
Topography and geography 141 
General geology 141 
Sedimentary rocks 141 
( 'amhrian ( V) schist HI 
Igneous rocks 141 
Structure 142 
Economic geology 142 
Mountains southeast of Pahute Mesa 142 
Shoshone and Skull mountains and the hills in the vicinity 142 
Topography and geography 142 
General geology 143 
Sedimentary rocks 143 
Pennsylvanian limestone 143 
Siehert lake beds 143 
Igneous rocks 144 
Quartz-monzonite porphyry 144 
Earlier rhyolite it;. 
