pacific 655 



Page Plate 



Pacific and Atlantic communication in Cambrian time 490 



Pacific faunas 489, 490, 491 



evolution ' 489 



f aunal realm 483 



invasions, Diagram of -. 347 



Paleogeographic map, Black River-Trenton invasions shown on. . . . 368 



Paleontologic criteria 481 



Paleontologist, Training of 291 



Paleontology, Systematic 507 



Paleozoic, Major divisions of 375 



Paleozoic and present conditions compared .•. . . 317 



Paleozoic, Arctic migrations of 488 



column, Additions since 1850 to 379 



continental seas. Condition and extent of 304 



cycles 315 



faunas, Localization in development of 501 



interior lands, relief 458 



land connections and paths of marine faunal migrations, 



Map showing 484 



oscillations, Small range of 335 



sediments in America, Thickness of 381 



seas, Shallowness of 361 



stratigraphic column, History of development 375 26 



time, Walcott's estimate of 295 



weathered surfaces, Preservation of 464 



Pamelia limestone 457, 513, 520 



(upper Stones River ) 545 



Pamelia-Lowville hiatus 556 



Pamelia-Stones River emergence at close of 550 



"Panola formation," Criticism of term 393 



Paradoxides 493 



Parkwood formation 476 



"Passage beds" 591 



Passage beds with or without interrupted sedimentation 528 



Paterina cf. stissingensis 623 



Pearisburg limestone . . 27 



formations . . 27 



trough 413, 414, 453, 543 



Peat deposits 360 



Pelagic forms 518 



species, Value in correlation of 517 



Pegram limestone . . 28 



Pelecypoda, Ancestry of 503 



Distribution of 503 



Pelham formation 673 



Pella limestone 29 



Peninsular tendency of axes 565 



Pennington shale 29 



