INDEX 85 1 



SESSIONAL PAPER No. 25a 



Page. 



Okanagan composite batholith 7, 432ff. 



— mountains 41 



range, formations of 425 



, geological history of 470 



, structure of 46(5 



Oligocene vulcanism 617 



Oolite 59, 64, 147, 671 



Orogenic movements, periods of 372,549 



Orogeny related to batholithic intrusion 478 



Orthoceras 112,511,512 



Osann, A 1 764 



Osoyoos batkolith 425,439, 774 



Ostrea congesta 85 



glabra S5 



Ostwald, W 770 



Ottawa river, analyses of ; 652 



Overthrust 56, 570 



, rotated 279 



P 



Pacific mountain system 21 



Palliser, J 30, 31, 32, 33 



Parallelodon 512 



Park granite 431, 464 



Pasayten geosynclinal 565,570 



monocline 601 



series 479 



, columnar section of 481 



■ , correlation of 505, SOOff. 



valley, origin of 600 



— — — volcanic formation 479, 481, 489 



Peale, A. C 88, 179, 180, 185, 188, 270 



Pecten operculiformis 48S 



Pend D'Oreille group 271 



, correlation of 275 



■ marbles 272 



-mountains 9 



schists 272 



Peneplanation, in Rocky Mountains 605 



, in Belt of Interior Plateaus 617 



--, in Cascade Mountains 621 



Penhallow, D. P 2, 3, 322, 351, 397, 487, 488, S00-S40 



Pentremites 513 



Peridotite 337 



, nodular (dike) 437 



, origin of 778, 7S2 



Petrasch, K 753 



Petrogenic cvcles , 471, 477, 760 



Pfaff, F. W 661 



Phacolith 718 



Phillips formation 108 



Phcenix volcanic group 37S, 383 



Phragmites 811 



Phyllites rhomboideus S4 



Physa 87 



Picea cohimbiensis 803 



Picrite 337 



Piedmont glaciers 57S, 596 



Pillow lava „. .. .. 217,514 



Pinnatopora 511,513 



