INDEX. 



417 



Page. 



Prospect Peak, fault 15 



Ridge, Cambrian rocks 21 



description 19 



section 102 



structure 20, 99, 107 



Pumico and Tuff 238 



Pumices at Hornitos Cone 239 



Purple Hill, rhyolite 380 



Pyrites 310 



Pyroxene in basalt 387 



pyroxene-andesite 355, 362 



Pyroxcno-andcsite and basalt, relative age of 252 



apatite in 359 



augite in 356 



Augusta Range 260 



blotite in 359, 363 



Cliff Hills 154, 239, 361 



Cortez Range 260 



feldspar in 349, 361 



hornblende in 358, 363 



hypersthene in 356, 362 



in Great Basin, age of 260 



magnetite in 359, 363 



mineral composition 239 



Mt. Davidson 281 



oli vine in 364 



pyroxene in 355, 362 



quartz in 360, 363 



Richmond Mountain 233, 239, 348 



Shoshone Range 261 



tridymite in 360 



Truckee Canyon 260 



tuff 385 



Wahweah Range 260 



Pyroxenic magma 254, 255 



Q 



Quartz and sanidine in rhyolite, intergrowth of 375 



conglomerate, with secondary enlargement of 



quartz grains 346 



grains, recrystallization of 55 



in andesitic-pearlite and (Incite 370 



basalt 390,393 



basic lavas 263 



granite 337 



granite-porphyry 339 



hornblende-mica-andesite 366 



pyroxene-andesite 360, 363 



rhy iilite 376 



Peak, Pahranagat Range 197 



Quartz porphyry 220,345 



Adams Hill 221 



Bullwhacker Mine 221 



Ruby Hill 117 



Quaternary valleys 31 



R. 



Ravens Nest, Pinon Range 200 



Ravines in Nevada limestone : 148 



Red Ridge, Silverado Hills 150 



Rescue Canyon rhyolite 237, 379 



fault 14, 18, 151, 154 



displacement 19 



1 1 ill 73, 79, 80, 152 



Rhyolitr. absence of ferro-magnosian minerals 266 



age of 276 



MON XX 27 



Page. 



Rhyolite, allanite in 262,379 



along Hoosac fault 244 



Jackson fault 300 



Ruby Hill fault 244,:(04 



and basalt, differentiation of 286, 291 



ore, relative age of 309 



hiotite in 376 



Brown's Canyon 137 



clays 304 



cutting Hoosac Mountain 113 



dike in Dunderberg Mine 309 



dikes on Prospect Ridge :M7 



encircling Alhambra Hills 153 



feldspar in 375 



feldspar microlites in 378 



garnet in 282, 377, 379 



Mahogany Hills 137 



microscopical character 374 



mineral composition 237 



penetrating homblende-andesite 250 



physical features 237 



plagioclase in 376. 37fl 



Purple Mountain 238.300 



quartz in -176 



sanidine in 375,379 



zircon in 377 



Rhyolitic pearlite 378 



pumice 380 



allanite in 381 



in contact with basalt 381-385 



Richmond Mine, Cambrian fossils 43.118 



Mountain, altitude 4 



and Cliff Hills compared 155 



andesite 240,348 



basalt 252,386 



description 25. 240 



fauna 90 



junction of fault lines 271 



limestone 167 



pyroxene-andesite 212 



rhyolitic pumice 381 



source of lava 271 



Richthofen. F. von, classification of rhyolite 374 



origin of igneous rocks 275 



Roberts Peak Mountains 3.203 



Rosenbusch, H., cited 342.389 



Roth, Justus, origin of igneons rocks 274. 275 



Roundtop Mountain Ill 



Ruby Hill fault 17,101,302,307 



ore deposits 301 



quartz-porphyry 117 



region 115 



underground drainage channels 315 



S. 



Salt Lake, altitude 



Sanidine in andesitic pearlite 234 



rhyolit* 375. 379 



Schell Creek Mountains 47 



Secondary dikes, granite-porphyry 222 



fissureon Ruby Hill 305 



Secret Canyon, description 109 



shale W 



description 39 



thickness 39 



Sentinel Peak 68.79 



