290 



INDEX. 



Page. 



Brougher Mountain, section near, diagram showing.. 41,43 

 view of 46 



Brougher shaft, section in, figure showing 116 



Burro fault, discovery of 79 



Burro veins, data concerning 127-129 



structure of, section showing 128 



Butler. Jas. L., gold discovered by 21,25-20 



leases by 26 



on Monitor Valley springs 257 



Butler Mountain, character of 44, 110-111 



elevation of 25 



erosion on 113 



eruptions on 67 



lava from, analysis of 58, 60, 65-66 



rocks of 36,45,55,60-61 



section near, diagram showing 44, 48, 49 



view from 24, 44 



view of 44, 46 



Butte Tonopah shaft, data concerning 199 



C. 



Calcite, alteration of earlier andcsite to 210 



formation of 22, 229 



veins of 101-104 



California fault, location of 167 



rocks at 38,79 



Cambrian rocks, occurrence of 30 



Cavities, filling of, veins formed by 85 



Celebes, rocks of 284 



Chalcopyrite, character of 88 



occurrence of 22, 95 



Chlorite, alteration of earlier and esite to 22,210 



Cinder cones, occurrence of 45 



Circle of fire, location of 279 



ores of 286 



rocks of 279-280, 286 



Circulation of water, channels of 85 



channels of, alteration in 210 



Claims. See Mines. 



Coal, character and occurrence of 29 



Comstock, Nev., alteration at 211-212 



ores of Tonopah and, comparison of 22, 



270-271,273-274.278 



section at, figure showing 277 



underground temperatures at 265-266 



figure showi ng 265 



Contacts, phenomena of 44, 49, 79 



Corbicula occidentalis. occurrence of 67 



Coscinodiscus radiatus, occurrence of 70 



Crislo vein, section of, figure showing 277 



Cross faulting. .See Faulting, cross. 



Cross walls, effects of 85 



figure showing 173 



occurrence of 119 



D. 



Dacite, analyses of 57, 58, 60, 65, i>6 



character of 21, 36-51, S8-61 



classification of 59-60 



contact of, section showing 48 



fault blocks and, displacement of, diagram show- 

 ing 46 



occurrence of 21,36-51 



origin of 22, 63 



sections of, diagrams showing 40, 41, 44, 45, 48 



shattsin 200-204 



Siebert tuff and, contact of, figure showing 45 



MI- w nl 46,48 



Page. 



Dall, W. H., fossils determined by 66 



Dana, J. D., on pyroxene 248 



Daubree, A., on underground water 254 



De Lamar, Idaho, ores of 276-277, 285 



ores of Tonopah and, comparison of 22, 271-274, 277 



section at, figure showing 277 



Depth, temperature and, relations of. See Temperature. 



Desert Queen shaft, depth of 197 



description of 125-127, 193 



r eks in 125-12?! 193 



section through, figure showing 177 



values in 97 



veins in, plan showing 13 



water in 105, 125 



workings at. plan of 126 



Devils Punchbowl, hot springs of 257 



Differentiation theory of origin of lavas 61-66 



tests of, by analysis 64, 65, 60 



Dikes, occurrence of 44-45, 73-74 



section showing 49 



Doelter, C., on museovite 231 



Dominian, Leon, measurements by 263 



E. 



East Indies, rocks of 279-280, 283 



Eocene rocks, fossils from 66-67 



Eocene time, history in 66, 69 



Epidote, occurrence of 250 



Erosion, amount of 1 10-1 11 



effects of 23 



features of 111-112 



progress of 109-111 



rock resistance and, relations of 113-114 



Eureka, Nev., andesite from, analysis of 219,244 



daciteand rhyolite from, analysis of 58,65 



F. 



Fault blocks, displacement of, diagram showing 4R 



Faulting, age of 72 



character of 22, 141-14(1 



dikes along 73-74 



finding of 79-80 



location of 115-116 



occurrence of 37-38, 47, 75, 149, 164, 184 



origin of 21, 47, 72, 80, 146 



principles of 72-82 



topographic features due to 74-79, 114 



Faulting, cross, effects of 77-79 



theory of , 157-161 



diagrams illustrating 158, 159, 160, 161 



Feldspar, alteration of 208, 21 1-1!] >, -JIM 



alteration of, chemistry of 230-231 



Fissures, origin of 104 



Formations, geological, age of s-?2 



description of 30-66 



succession of 71-72, 274 



Fossils, occurrence of 66-67, 69-70 



Fraction dacite breccia, age of 40 



character and occurrence of 39-40 



section of, diagram showing 40 



Fraction Extension shaft, depth of 106 



location of 200 



rocks in 201-202 



Fraction faults, cause of 146 



description of 141-146 



discovery of 79 



effects of 152 



Wandering Boy fault and, age of 163 



