CONTENTS. 11 
Descriptive geology — Continued. 
Amargosa Mountain system — Continued. 
Slate Ridge 191 
Topography and geography 
General geology 191 
Sedimentary rocks . 101 
Cambrian 101 
Later tuffs L 
Igneous rocks 
Post-Jurassic granite . 
Pre-Tertiary quartz-monzonite porphyry L93 
Pre-Tertiary diorite porphyry 193 
Earlier rhyolite 193 
Later rhyolite 193 
Basalt 194 
Structure 194 
Economic geology ,_ 194 
Death Valley L95 
Topography and geography 195 
General geology 197 
Sediments : 107 
General statement 197 
Tertiary lake beds (including Siebert lake beds) 198 
Older alluvium 199 
Geologic history 200 
Economic geology : 201 
Panamint Range 201 
Topography and geography 201 
General geology 202 
Sedimentary rocks 202 
Prospect Mountain ( ?) quartzite 202 
Pogonip limestone 202 
Pennsylvanian limestone 203 
Older alluvium 204 
Recent alluvium i 204 
Igneous rocks 205 
Earlier quartz-monzonite porphyry 205 
Quartz monzonite 205 
Soda syenite - ( >7 
Granite 208 
Later quartz-monzonite porphyry 208 
Diorite porphyry 208 
Basalt 209 
Structure 210 
Economic geology 211 
Index 213 
