INDEX TO VOLUME 15 



631 



Page 

 Ontario lake, Region at east end of, Pre- 



glaeial drainage of, Map showing 241 



, Rivers in 221 



, Topography and drainage 



of 215-240 



Opeche formation, Character and extent of.. 383 



385-386, 408, 410, 438 



, View showing 382 



Oppel, von, Title of work by 6 



— , Views of, on ore deposition 8 



Ordovician fossils, Rocky Mountain Front 



range, Occurrence of 414 



— rocks, Bighorn mountains, Character and 



extent of. 394, 395-39G, 434 



, Black Hills region, Character and ex- 

 tent of 382-384, 434-435 



, Rocky mountain Front range, Char- 

 acter and extent of. 413,414-415, 434-4% 



Ore deposition, Bibliography of Bibliog- 

 raphies of 28 



, Definition of 2 



, Development of knowledge concern- 

 ing 3-28 



, Prehistorical views on 2-3 



, Theories of, Scientific period of. 9-19 



, Speculative period of 3-9 



, Verification period of 19-28 



Origines, Views of, Concerning fossils 2 



Ormont, V. C, Title of paper by 581 



Orton, Edward, cited on Pottsville forma- 

 tion in Kentucky 94 



Pottsville formation in Ohio... 77, 79, 8() 



81, 82, 83, 85, 86, 88, 89, 90, 91, 92 



Otonabee river, Ontario, Course of 228 



Owl Canyon, Colorado, Section in 417 



Oxford, West Virginia, Section at 197 



Page, W. N., cited on Pottsville formation 



in West Virginia 176 



Pahasapa limestone, Character and extent 



of 383,384 



, Correlation of. 435 



Pallas, P. S., Geological work of 9 



Panthek Creek district, Pennsylvania, Goal 



beds in 46 



Parker hill, New Hampshire, Section across 464 

 Patton, Horace B. ; Fault planes in the Da- 

 kota fire-clay beds at Golden, Colorado 



[abstract] 583 



Peach Orchard coal bed, Synonymy of 205 



Peale, A. C, cited on Dakota formation 429 



Red beds 421 



Peerless coal bed, Occurrence of, in West 



Virginia 163, 166 



. See also Campbell Creek coal beds. 



Penhallow, , cited on fossil wood found 



beneath Iroquois beach 366 



Pennington sandstone, Occurrence of, in 



Virginia 148 



Pennsylvania, Pottsville formation in..39-76, 210 

 Perch creek, New York, Course and feat- 

 ures of. 237 



, Underground course of 235, 237 



Perdue, A. H., Record of remarks by 553 



Permian rocks, Bighorn mountains. Char- 

 acter and extent of. 394, 397-398, 436-441 



, Black Hills region 383, 385-387, 436-441 



, Hartville uplift 408, 410, 438-440 



— — , Laramie range 402, 403-404, 436-441 



, Roeky Mountain Front range. ..413, 415-424 



436-441 

 Perry park, Colorado, Carboniferous rocks 



in 415 



, "Dakota" sandstone near 430 



, Ordovician rocks in ... . 414 



, Gateway of, View of. 422 



, Section in 42 



Pescadero sandstone, Age of. 582-583 



in California, Occurrence, Character, 



and thickness of 582 



Page 

 Peterboro lake, Beaches of lake Iroquois 



near 357-358 



Petrified wood from Egypt, Fossil water 



fungus in, Abstract of paper on 550 



Petrolia, Pennsylvania, Section at 71 



Phalen, W. C, quoted on character of dikes 



at North Lisbon, New Hampshire 467 



dike rocks from North Lisbon, New 



Hampshire 476 



Philippi, West Virginia, Sections at and 



near 185-186, 186-187 



Photograph Committee, Report of......... 557-558 



Physiography and glaciation of the western 

 Tian Shan mountains, Turkestan [ab- 

 stract] ; W. M. Davis and E. Hunting- 

 ton 554 



Pickens, West Virginia, Section at 183 



Piedmont sandstone, Lithologic character 



of. 49 



, Synonymy of 204-2()5 



Pigeon lake," Ontario, Features of 226-227 



Pierre shale, Character and extent of 383 



392-393, 394, 400, 402, 407, 413, 433-434, 447 



, Fossils of 393, 411, 433, 447 



Pittsburg coal bed, Occurrence of, in West 



Virginia 173-174, 180, 200 



, Synonymy of. 206 



Planetesimal hypothesis of earth origin, 



Geology under 243-266 



, Discussion of 262-266 



, Extra edition of, authorized 567 



Platt, Franklin, cited on Pottsville forma- 

 tion 51, 54 



Platt, W. G., cited on Pottsville formation.. 57 



58, 59, 71, 203, 270, 278 

 Platte canvon, Colorado, Cretaceous rocks 



in 430 



Platte river,Pennsylvanian fossils collected 



on 409 



Pleistocene deposits. See Iroquois lake, 



Beaches of. 

 Pliny, " Natural History" of, Reference to.. 3 

 Pocahontas coal bed in Virginia.. 154, 155, 156, 162 

 West Virginia , 157 



— formation, Flora of, Geographic extent of. 272 



, Horizon of 271 



, in Virginia 153, 155, 156 



West Virginia 158, 160 



, Thickness of 271-272 



— stage, Deposition during 271-272 



Pomperaug valley, Connecticut, Structural 



geology of 554, 555 



Ponca, Nebraska, Greenhorn limestone at... 575 



Po river basin, Italy, Deposits in 566-568 



Posepny, F., Reference to discussion of Sand- 

 berger's theory of lateral secretion of 



ores by 19 



— , Views of, on ore deposition 23-24 



Post-glacial changes of attitude in the Ital- 

 ian and Swiss lakes ; F. B. Taylor... 369-378 

 Potts tunnel, Pennsylvania, coal beds near.. 47 

 Pottsville, Pennsylvania, Pottsville forma- 

 tion near 41 



— , Section at 43-44 



Pottsville formation, Appalachian basin 



containing, Arches or barriers within 



278-279 



, Development of. 271-274 



, Eastern margin of 276-277 



, Figure of. 267, 268-269 



, Subsidence and extension of... 



274, 280 



, Correlation of. 38-39, 201-204 



, Deposition of 267-282 



, Map showing 267 



in Alabama , 126-136 



Kentucky 92-114 



Ohio 76-92 



Pennsylvania 39-76, 210 



, Thickness of. 40, 47 



Tennessee 114-126, 136-147 



