INDEX TO VOLUME 19 



613 



Pajre 

 I'oitCDPiNE valley, Alaska, Devonian 



limestone and shale of 329-330 



of 327 



, Fauna of. . . 320, 323, 325-328, 



332-335, 337 



.Geologic reconnaissance of 315-338 



. Lava sheet at upper Ram- 

 parts of 33T-33S 



, Pre-Ordovician series of rocks 



of 320-322 



— — .Silurian dolomites of 324 



, Stratigraphy of 320-337 



.Structure of 317-320 



, Tertiary beds of 336-337 



, Topography and drainage of. . 



315-317 



PoRrHTRY dike, Character of 227-228 



in New Ulm stone quarry, Occur- 

 rence of 227 



Port Clarence limestone, Probable age 



of 274 



— Darlington harbor, Enclosure by bar- 



rier beaches of 475 



Post-Archean time. Duration of 128 



Post-Glacial erosion. Crazy Mountain 



region 566-567 



Potsdam. Meguma series supposed to be 



100-101 

 — , Paleozoic rocks classified as 163 



— sandstone. Character and thickness 



of 158-160 



, Estimate of thickness of 168 



— ■ — , Occurrence in Canadian section 



of 166 



— , Terms "New Ulm" and "Pipestone 



quartzites" used for 225-226 



Pots. MAN formation, Unconformity of. . 



165-166 

 Powell. .1. W.. cited on stream-carry- 

 ing capacity 205 



— . Title of paper by 56 



Pratt, Joseph Hyde, Title of paper by. 537 

 Pke-Cambriax. Characteristics of for- 

 mation of 407 



— . Classidcation of 27. 28 



— . Divisions of the 19. 20 



— formation. Classification in other 



areas of 21-27 



in China 25-27 



• Cordilleran region 21 



Finland 23-25 



Hastings district 2-4 



Huronian district 4 



Lake Superior region 7-21 



Scotland 21-23 



. Structure of 12 



— . Major divisions of the 13-21 



— origin of Meguma series Ill 



— , Problem of the 1-2S 



— rocks. Evidences of life in 13 



. Stratigraphy of 1-12 



. Term "primary"' applied to 2 



— . Unconformity between Cambrian for- 

 mation and 1, 2 



Pee-Ordoviciax, Certain Upper Yukon 



rocks proved to be 264-271 



— rocks of I'orcupine valley. Thickness 



and character of 320-322 



President. Election of 521 



Presidential address (C. R. Van Hlse) 



1-28 

 Presque Isle point. Location and char- 

 acteristics of 486-488 



— — spit. Sketch map of 487 



. — • — , Trenton limestone cuesta at 475 



Pries lake. View showing bluff below. . 253 

 iRiNCi: Edward island. Supposed Per- 

 mian moraine in 353 



Prindle. L. M., Investigations in tipper 



Yukon by 25S. 260. 268 



Page 



Probable age of the Meguma (gold- 

 bearing) series of Xova Scotia. By 



J. E. Woodman 09-112 



Problem of the pre-Cambrian, The (C. 



R. Van Rise) 1-28 



Proceedings of the twentieth annual 



meeting. Report of 513-600 



Prosser^ Charles S., Abstract of paper 



by 553 



Proterozoic, Use of term 15 



Proustite, Analysis of 95-96 



— , Characteristics of 95 



— , Occurrence at California mine of. . 93-98 

 Psychosphere, Functions of the.. 214-216 



POMPELLY, , Geological work In 



Michigan by 7 



— , Study of Huronian area by 5. 6 



Purdue. A. P. ; Structure and strati- 

 graphy of the Ouacheta Ordovician 

 area, Arkansas. (Abstract.)... 556-567 



Quarternary age, Glacial drift of red- 

 stone region of 236-241 



— , Occurrence in Upper Yukon rocks of. 



309-310 

 QuiNCY mine. Analysis of waters at... 504 



Radioactivity and the earth's age. 127-135 



— , Distribution of 135-144 



— , Gradient of earth due to 132 



— , Relations of cosmogony and geology 



to 113-146 



• — , Summary of investigations on. . 144-146 

 RADiuii, Discovery in pitchblende of. . . 114 



uraninite of 114 



. — , Distribution of 137-139 



— emanation. Weight of 119 



— , Experiments in disintegration of . . . 115 



— . Probable life of 116-117, 119 



— , Weight of 116 



Railroads in arid country. Effect of 



floodsheets on 80. 81 



Rainfall, Annual amount of 215 



Ramsay, Sir William, cited on experi- 

 ments in helium 114 



glacial deposits in England 352-353 



— • radioactivity processes 118 



— , Discoveries by 119 



Rattlesnake creek, California, Plant 



beds of 382-384 



, Relation to other formations of 



plant beds of 383 



— mountains, Chugwater red beds in.. 433 



, Colorado formation In 453 



, Deadwood formation in 409 



. Shirley hills. Madison limestone 



of 412-413 



. Tensleep sandstone of the 415 



. Umsden formation in 414 



Raymond, Percy Edmund, elected a 



fellow 522 



Reade, Mellard, Post-Arcbean time 



estimated by 129 



"Recession of the falls of St. An- 

 thony" 29 



Red beds. Pulpit rock. Section of 423 



.Red mountain, Section of 423 



Redding creek, California, Plant beds 



of : 383-384 



Red mountain. Section of Casper for- 

 mation on 424 



— sandstone formation of southeastern 



Minnesota. (Read by title.) 539 



— soil of La Plata valley. New Mexico, 



Analysis of 54 



Redstone. Description of 221 



— . Location of 221, 222 



— quartzite, Faulting and erosion of. . . 227 



