INDEX. 



A. 



Pago. 



Accessory minerals in granite 338 



granite-porphyry 341, 345 



hornblcmle-nih-a andesite 364 



lavas 262 



Acid and basic magmas 254 



Adams Hill, description 117 



mines 290 



Aliatc Pass 181 



Weber conglomerate 92 



Alhambra Hills 25 



basalt :!G4, 392 



description 153 



Allanite in granite 337, 338 



granite porphyry 341 



lavas 262 



rhyolite 379 



rhyolitic pumire 381 



Alpha fault 158,160 



I Vak, altitude 4 



region of 159 



Ridge, description 28 



Amphitheater in Water Canyon 158 



Analyses of Washoe rocks 282 



amlesitic pcarlite 264 



basalt. Basalt Peak 264 



Richmond Mountain 264 



Washoe 282 



< 'ambrian iron on' 37 



limestone, Bell shaft 37 



Pott's Chamber 37 



Tip Top incline 37 



coal 98 



dacite ^ 264 



Washoe 282 



granite-porphyry 228 



Hamburg limestone 40 



hornblendf-amlfsitc, Washoe 282 



liorublendr-niira-aiiili-sito 264 



Waslioc 282 



bypersthcne 356 



Kelly ore 313 



Lone Mountain limestone 58 



Lord Byron ore 313 



I'oiionip linifstoiir 49 



Prospect -Mountain limestone 37 



pyroxene-amh-.sitc 264. 266 



rhyolite 264 



\V ashoe 282 



Ruby Hill ore all.' 



Ancient coast line 176 



Andesite, alteration products 234 



Andesites at Washoe 22 



relative age of 278 



Andesitic pearlite 234,368 



and dacite, modifications 871-373 



Anorthite in pyroxene-andesite 240 



volcanic rocks 354 



Anticline in Fish Creek Mountains 210 



Newark Mountain 156, 210 



Pinon Range 201 



Prospect Ridge 20 



Weber conglomerate 162 



west of Wood Cone 123 



Antimony in Kuby Hill ore 312 



Apatite in andesitic-pearlite and dacite 370 



granite 337, 338 



granite-porphyry 345 



hornblende-mica-andesite 367 



lavas 262 



pyroxene-andesite 359 



Argillaceous beds at Eureka 178 



Arsenic in Kuby Hill ore 312 



Artemesia tridentata 3 



A t rypa Peak, altitude 4 



section across 65 



structure 22, 125 



Augite-andesite (pyroxene-andesite) 233, 239 



Augite in audesitic pearlite and dacite 370 



basalt 387, 394 



pyroxene-andesite 356 



B. 



Bald Mountain Coal Company 97 



coal seams 95, 97 



Banded rhyolite 379 



Basalt and Rhyolite 285 



Basalt, anjiitc in 387, 394 



cutting pyroxene-andesite 252 



distinguishing characteristics 392 



feldspar in 386, 393 



hypersthene in 387, 394 



magnetite in 390 



mica in 394 



microscopical characters 386 



mineral composition 242 



olivine in 387, 393 



penetrating rhyolite 253 



piedmont ite in 393 



pyroxene in ' 387 



407 



