630 



BULLETIN OP THE GEOLOGICAL SOCIETY OF AMERICA 



Page 

 Owasco valley, Cross-section profile of. 61 

 , Failure of ice erosion in, View of 64 



Painted Desert beds, Character and 



thickness of 481-482 



-, Geologic equivalents of 482 



Palagonite, Analyses of 112 



— , Mineral constituents of, Diagram 



showing 130 



— , Formation of, Theory of 117-124 



— , Occurrence of, in Holyoke trap sheet 



103-104 



— , Plumose diabase and, from the Holy- 

 oke trap sheet, paper on, by B. K. 

 Emerson 91-130 



— , Thin section of, Figure showing... 129 



Paradox valley, Colorado, La Plata for- 

 mation in 473 



Park Avenue railroad bridge across 



Harlem river. Section at ... 163, 164 



Patapsco formation, Age and condi- 

 tions of deposition of 325 



Peachbottom slates, Age and strati- 

 graphic place of 330, 338-339, 340 



-, Distribution of, in Maryland and 



Pennsylvania 338 



Peale, A. C, cited on Red beds of Colo- 

 rado 450, 472, 473, 474, 490 



Peary, R. E., cited on glacial action in 



Greenland 34 



Peet, C. E., cited on history of Hudson 



River valley 155 



Pegmatites of Piedmont Pennsylvania, 



Occurrence and character of 322 



Pele and the evolution of the Wind- 

 ward archipelago ; R. T. Hill . . 243-288 



— Mont, Eruptions of, Course of.. 248-250 



— , Products of 250-254 



, Aqueous 250-251 



, Gaseous 250-251 



, Rock 250 



, Solid matter discharged 



during 254-255 



, Theories explaining, Inade- 

 quacy of 279-281 



, History of 255-256 



.Mechanism and work of.... 246-250 



, Present condition of 566-569 



, Views of 567 



Pennsylvania, Piedmont district of, 



Character and extent of 291-292 



— ■ — , Deposits in, Correlation of. 340 



, Geology of 293-306, 327 



, Cambro - Ordovician rocks 



of 298-301 



— , Igneous rocks of 308-327 



— ■ — ■ , Pre-Cambrian rocks of ... . 294 



— — , Ordovician rocks of . . . . 301-306 



, Paper on, by F. Bascom 289-328 



, Structural geology of.. 306-308 



327 



— Railroad Company, tunnels of, across 



East river, New York, Rocks dis- 

 closed by 170 



Hudson river, Rocks 



disclosed by borings for 176-178 



, Section across 



river at 177 



— and Maryland Piedmont formations, 



correlation of, paper on, by E. B. 



Mathews 329-346 



Perkins, G. H, Acknowledgments to.. 419 

 — ; Tertiary lignite of Brandon, Ver- 

 mont, and its fossils 499-516 



— , Title of paper by 580 



Pernambuco, Stone reef at, Features 



of 2-3 



— , Literature of 11-12 



, Section of 3 



■ , Views of 1,12 



Page 

 Perpenti, Madame, Asbestos cloth man- 

 ufactured by 430 



Pervis, , cited on geology of An- 

 tigua 267 



Pettee, William Henry, Memoir of, 



by I. C. Russell 558-560 



— , Writings of 560 



Petrography, Section of, Proceedings 



of 573-576 



Philadelphia meeting, Proceedings of 



531-591 



, Register of 590-591 



Photograph Committee, Report of . . . . 590 

 Piedmont district of Atlantic coast, 



Character and extent of 290-291 



, Geology of 292-293 



Pennsylvania; F. Bascom. 289-328 



— .Cambrian rocks of 296-298 



, Cambro - Ordovician rocks 



of 298-301 



— -- ■ — , Character and extent of.. 291 



292 



— .Geological history of. 322-327 



■ — — .Igneous rocks of 308-327 



■ — , Ordovician rocks of . . . . 301-306 



, Pre-Cambrian rocks of ... . 294 



■ — .Sedimentary rocks of. 293-306 



.Stratigraphy of... 293-306,327 



, Structural geology of.. 306-308 



327 

 .Structure of 306-308,327 



— formations of Maryland and Penn- 



sylvania, correlation of, Paper on, 



by E. B. Mathews 329-346 



- — region of Maryland and Pennsylva- 

 nia, Geologic structure in, axial 

 lines of, Map showing 342 



— plateau of Maryland, Geological for- 



mations in 330 



Pine flats, San Gabriel mountains, 

 Granodiorite from, Character of 



194-195, 196, 197 



, Micropegmatite from, 



Character of 198-199 



canyon, Micropegmatite from, 



Character of 198-199 



Plagioclase. poikilitic, Figure showing 128 

 Playfair, John, cited on hanging val- 

 leys 76 



Pliny, cited on asbestos 430 



Plucking, Glacial, implications of, as 



to ice erosion 20 



Plumose diabase, Figure showing. 127, 130 



— — and palagonite from the Holyoke 



trap sheet; B. K. Emerson 91-130 



Plutarch, cited on asbestos 430 



Plutonic rocks, Compressibility and 

 plastic deformation of, Experiments 



on 564-565 



Pompeckj, J. F., cited on Alaskan pale- 

 ontology 392, 401, 409 



Pony hollow, New York, Moraine- 

 formed divide at head of 237 



Popo Agie river, Fossiliferous Triassic 



beds on 489 



Porte d' Enfer, Guadeloupe, Marine 



erosion at 271-272 



— — — , View of 270 



Port Graham, Cook inlet, Alaska, Ju- 

 rassic tuffs and limestone at 394 



Port Henry (New York) quadrangle, 



Map of 413 



Porto Seguro reef, Brazil, View show- 

 ing 5 



Post creek, New York, Lowered divide 



on 235 



, Moraine-formed divide at 



head of 237 



Powell, J. W., cited on geology of Uinta 



mountains 487, 517, 519, 523, 



525, 526, 527, 530 



