224 H. W. TURNER GEOLOGY OF THE SILVER PEAK QUADRANGLE 



Page 



Quaternary deposits 2 ^7 



Desert detritus 247 



Travertine or calcareous spring deposits 249 



Playa deposits : 249 



Sand dunes 249 



Recent detrital fans 249 



Granular igneous rocks • • • 249 



Granite and syenite 249 



Quartz-inonzonite 250 



Quartz-diorite 252 



Granular dike rocks 252 



Volcanic rocks 253 



Age 253 



Meta-rhyolite 253 



Rhyolite and dacite 251 



Andesite 257 



Basalt 257 



The succession of the lavas 258 



In general 258 



Older basalt 258 



Older andesite 258 



Older dacite 258 



Andesite and rhyolite 259 



Latite 260 



Later dacite 260 



Hypersthene-basalt 260 



Olivine-basalt 260 



Pleistocene basalt 260 



Contact metamorphisni 261 



Pyroxenite 261 



Serpentine 262 



Chloropal 262 



Structural features 263 



Introduction 



The following notes, based on field work done in 1899 and 1900, were 

 obtained while making a detailed geological map of the Silver Peak quad- 

 rangle for the U. S. Geological Survey. I was assisted in this work by 

 C. E. Knecht, of Stanford University. A paper was published in 1900 2 

 on the Tertiary lake beds (Esmeralda formation), and a short summary- 

 concerning the sedimentary formations in general of Esmeralda county 

 was published in 1902. 3 



2 American Geologist, vol. xxv, 1900, pp. 168-170 ; Twenty-first Annual Report of the 

 Director of the U. S. Geological Survey, 1000. 



3 American Geologist, vol. xxix, 1902, pp. 261-272. 



