Index to Volume _?. 455 



Page 



, formula of ;.."*'...'*.. . 333 



, optical properties 329 



, blue 335 



, chemical properties 337 



, formula .... 338 



, occurrence 335 



, optical properties 337 



— , Hydromagnesite 316 



— , Hypersthene 415 



— , Iddingsite 430 



— , Limonite 417 



— , Magnesite . 316 



— , Magnetite 416, 428 



— , Natrolite of amygdules 420 



— , Olivene 416, 428 



— , Opal of amygdules . . 420 



— , Orthoclase 414 



— , Pectolite 61 , 316 



— , Plagioclase 412, 427 



— , Prochlorite 340 



— .Serpentine 415,428 



— Talc 34 1 



— , Tremolite 340 



— , Zircon 319, 326 



Miocene 9 



— , Depression 149, 226 



— , Flints 4, 14 



— , of Contra Costa County 115, 117 



— , of Point Reyes 152 



— , of Point Sal 4 



— , Petrography 10 



— , Sea urchins 1 10 



— , Sediments 123. 134 



— , Shale 185 



Monterey Series 134 



, at Berkeley ... 363 



, Conditions of deposition 445 



, Erosion 446 



, Faulting . 368 



, Fossils 365, 367 



, Geomorphic features 370 



, Limestones 366 



, Rhythm of deposition 36s, 444 



, Sandstones 365 



, Structure 368 



, Thickness 369 



, Unconformity at base of 363 



Montijo, conglomerate 234, 241 



-.Gulf 234 



Mount Diablo, sea urchins in 



Newcombe, C. F., collections by 101 



Nicaragua, coastal plain of 267 



NORITE 62, 67 



— , Gabbro 62, 67 



Ocean Floor, depth 197 



Olivene-gabbro 63, 68 



Norite 63 



Norfte-gabbro 63, 6y 



Orindan Formation 365, 371 



, Intrusives 373, 398 



, Thickness 373 



, Unconformity at base 371 



Orogenic Movements, effect on topography 171 



Osborne Bank /<?/, 186, 202 



Oscillations of Coast 120 



Osmont, V. C, on thickness of John Day . 298 



Ostracoda, Bollinger Canon 95 



— , Pliocene 93, 100 



— , San Pablo Valley 94 



— , Wildcat Canon 94, 05 



Otis, W. H. Map by 352 



Overwash gravels of Point Reyes .... 142 



Page 



Pah Ute Lake 291 



Palache, Cm cited on Crossite 330 



Serpentine 75, 315 



Panama 232 



— , Formation 233, 234, 244 



, Fossils 233 



— , Map of 2J4 



— , Middle Pleistocene uplift 261 



— , Modern stream gravels 264 



— , Oldest rocks 237 



— , Origin of stream courses 265 



— , Pleistocene formations 257 



— , Pleistocene peneplains 257 



— , Pre- Pliocene history 249 



— , Recent depression 262 



— , Tertiary peneplain 252 



— , Tertiary uplift 255 



— , Tilting of Isthmus . .251 



— , Topography 234, 237, 251 



— , Volcanic Complex 245 



Parata, Bay 236 



— , Formation 263 



Peneplain, definition of 156 



— , Limitations of term 161 



— , Necessary conditions of . 158 



— , Objections to theory of 157 



— , Theory of 155 



Peridotite 4, 50, 356 



— , Age of 74. 89 



— , Association with gabbro 76, 77 



— , Banded structure 78 



— , Compared with other peridotites . 75 



— , Distribution 89 



— , Lenses of gabbro in . . .... $3, 76 



Periodicity of volcanic rocks 438 



Petrography of Andesites 411 



— of Basalts 427 



Picrite 55, 63 



Pirsson cited on differentiation of rocks . . 86 

 Pleistocene 4, 6, 7 



— of Panama 257 



— of Point Reyes 141, 153 



— Oscillations 265 



Pliocene 93 



— , depression 226, 227 



— , of Berkeley Hills 352 



— , Sea-urchins 110 



Point Reyes Granite 



, Endomorphism 128 



, Petrography 124 



, Relations to other Massifs . . . .128 



Point Reyes Peninsula 120, 123 



, Geological literature 121 



— , Granite 122 



Point Sal 2, 



, Elevated beaches of 8 



, Geology 4 



, Map 4 



, Topography 3 



Post-Eocene earth movements of Panama. 264 



Post-Miocene erosion 227 



Post-Pliocene elevation 228 



Pre-Cretaceous of John Day Basin. . 27S, 279 

 Pre-c.r anitic crust of Coast Ranges . . .130 



, of Point Reyes 152 



Protolabis beds 306 



Pyroclastic rocks 434 



Pyroxenite 57. 63, 72, 356 



Quartz-diorite 62, 66 



, of John Day Basin 279 



Quartzite of Point Reyes 131 



Quaternary of John Day Basin ... 312 

 — , Sea-urchins no 



