6 CONTENTS. 
Descriptive geology — Continued. Page. 
Region about Goldfielcl — Continued. 
Stonewall Mountain — Continued. 
General geology — Continued. 
Sedimentary rocks 84 
Cambrian 84 
Siebert lake beds 84 
Igneous rocks 84 
Post-Jurassic granite and granite porphyry 84 
Earlier rhyolite 85 
Quartz syenite and quartz-monzonite porphyry 85 
Later rhyolite 86 
Basalt — 87 
Structure : 87 
Economic geology 88 
Ranges north of Pahute Mesa 89 
Cactus Range 89 
Topography and geography 89 
General geology „. 89 
Sedimentary rocks 89 
Pogonip limestone ^ 89 
Eureka quartzite 90 
Weber conglomerate 90 
Igneous rocks 90 
Post-Jurassic granite porphyry and granite. '•><) 
Pro-Tertiary diorite porphyry 91 
1 [ornblende-biotite latite 91 
Earlier rhyolite 92 
Biotite andesite 93 
Augite andesite . 94 
Later rhyolite( ?) 94 
Basalt 94 
Structure 94 
Economic geology : 95 
Hills between the Cactus and Kawicb ranges 96 
Topography and geography 96 
General geology 96 
Sedimentary rocks 96 
Eureka (?) quartzite 96 
Igneous rocks 96 
Rhyolite 96 
Biotite andesite 96 
Basalt 96 
Monitor Hills 97 
Genera] geology 97 
Sedimentary rocks 97 
Siebert lake beds 97 
Igneous rocks 07 
Granite 97 
Rhyolite 1 97 
Basalt 1 97 
Structure 98 
Cactus Flat < 
Gold Flat i 
