606 



BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 

 Schist, Hornblende, Manhattau island, Con- 

 tact alteration by 4:74-477 



, Chemiearcompositioii of 438-439 



.Derivation of, Hj'potheses con- 

 cerning 446-448 



, Dike-like extension of outcrops 



of 4G8-470 



, Fracture and faulting in 431 



, Hematite in, Plate showing 435 



^ Macroscopic description of... 432-434 



, Microscopic description of... 434-438 



. Occurrence of 429 



, Phenocrysts in 477-478 



, Photomicrograph of 435 



— , Plications in 430 



, Specific gravity of 434 



, Structure variations of 429-432 



, Thin sections of, Plate showing.. 435 



— , Quartz-diorite, Manhattan island, Fault 



breccia in quartz vein in 431 



^ Microscopic description of 435 



, New Roehelle, New York, Microscopic 



characters of 482 



Schists, Hornblende, Analyses of 439, 447, 



448, 458, 459 

 , Derivation of, Hypotheses concern- 

 ing 455-480 



, Need of information concerning. 422 



— , Silicious, of Manhattan island. Stages of 



metamorphism of... 424-425 



ScHi.icHTEB, Charles S., Acknowledgment 



to Ill 



— ; Discussion of the motions of a discoid 



meteorite , 112-116 



ScHRADEE, F. C, and A. C. Spencer, cited on 

 physiography of the Copper River dis- 

 trict " 118, 120 



, quoted on Chugach mountains 121 



ScHVCHEKT, Chari.es, Acknowledgment to... 407 



^, cited on the Mohawkian group 414 



ScHUYi.Kii.i, valley, Harrisburg peneplain 



remnants in 286 



, Somerville peneplain remnants in 286 



Schweitzer, P., Analysis of micaceous gneiss 



by ." 426 



SciEXCE, Ab.«tracts of papers before the Geo- 

 logical Society of America printed in.... 517 

 521, 531, 532, 535, 543, 544, 547 

 .548, 549, 553, 554, 558, 560 

 ScoRESBY sound, Submerged valleys extend- 

 ing from .'. 219 



Scott, .\. C, Acknowledgment to 112 



Scott, W. B., Record of remarks by 532 



Secretary, Election of H. L. Fairchild as... 503 



— , Report of 497-499 



Sexarmoxt, H. de, cited on chalcocite 271 



Serpektixe, Analysis of. 490 



— on Manhattan island. Genesis of 421-494 



Sharon, Pannsj'lvania, Pocono formation at. 24 



Sharpsvif.le sandstones, Age of 40, 41, 42 



, Correlation of. 27 



, Fossils of 25 



Shenandoah mountain, Virginia, Pocono 



formation at and near 27 



— valley, Harrisburg peneplain remnants 



in...' 283-284 



, Somerville peneplain remnants in 283 



Shenango formation. Correlation of. 22 



, Equivalents of 83, 85 



, Fossils of 8.5-86 



, Occurrences of 530 



— sandstone. Character and thieliness of. 24, 25 



26, 32. 33, 34 



, Correlation of. 18, 26 



, Stratigraphic place of. 31 



— shales. Age of 40,42 



, Character and thickness of. 53 



, Occurrence of. 53 



— stage, Area of sedimentation during 95-96 



, Thickness of deposits during 95-96 



Page 



Sherwood, A., cited on thickness of Mauch 



Chunk formation 48 



Mississipnian in Pennsylvania. 20 



Shetland islands. Submerged valleys near.. 



219-220 

 Shickshinny mountain, Pocono formation 



in. Thickness of 19 



Shifting of faunas as a problem of strati- 

 graphic geology; H. S. Williams 177-190 



, Illustrations of, as distinguished 



from migration of species 182-183 



Sideling hill, Pennsylvania, Pocono forma- 

 tion at, Thickness of 19 



Silicious limestone. Correlation of 84,85 



Silurian coral reefs, on island of Gotland, 



Occurrence and character of 343-.344 



, New York 348 



, southeastern Wisconsin, Occur- 

 rence and character of 341 



Sinclair, William J., Title of paper by 564 



— , and John C. Merriam, Title of paper by.. 563 

 Skeena river, Alaska, Antecedent charact'er 



of 126 



Slatington (Pennsylvania) quadrangle, To- 

 pographic features of 284-285 



Smith, A. F., et al. ; Glacial boulders along 

 the Osage river in Missouri [abstract].. 553 



Smith, D. T., Title of paper by 56:i 



Smith, E. A., cited on the Keokuk forma- 

 tion in Alabama 42 



Smith, George Otis, cited on geology of Fox 



islands, Maine 2tt2 



— , Record of remarks by 5"'.2 



Smith, T. Guilford, Cost of Emmons memo- 

 rial tablet borne by 12 



Smith, \V. S. T., elected Fellow 2 



— , Life-membership secured by 499 



Smith and Brush, Analysis by 490 



SoLLAS, W. J., cited on mechanical rock 



analysis 460 



Somersetshire, England, Clastic dikes in, 



Occurrence and origin of 254, 258-259 



Somerville, N. J., Peneplain remnants 



near 283 



Somerville peneplain. Type area of 283 



South Dakota, Locality of fossil fishes in.... 542 

 South Table mesa, Leucite hills, Origin of.. .S2l 



, Rocks of 320-321 



, View of 319 



Species, Characteristic, Use of, in correla- 

 tion 188 



—, Dominant, Use of, in correlation 188 



~, EflFects ot faunal .shifting on 184-185 



Spencer, Arthur C: Pacific Mountain sy.>*- 

 tem. in British Columbia and Alaska.. 117-132 



— , Title of paper by 9 



— , and F. C. Schrader, cited on phj'siogra- 



phy of the Copper River district 118, 120 



, quoted on Chugach mountains 121 



Spencer, J. W., cited on submerged valley 



of the Saint Lawrence 211 



— ; Submarine valleys off the American 



coast and in the north Atlantic 207-226 



— , Title of paper by 543 



— , Record of remarks by 543 



Spencer, West Virginia, Section at 65 



Spherulitic texture in the Archean green- 

 stones of Minnesota [abstract] ; J. Mor- 

 gan Clements 555 



Spring. W., cited on dike structure 249 



Spurr. J. E., cited on date of erosion of the 



Yukon plateau, Alaska 131 



Squaw sandstone, Stratigraphic place of. 43 



, Thickness of, West Virginia 30, .31, 32 



Stamping creek, West Virginia, Section at.... 57 

 Stanford University, California, Clastic 



dikes near .'. 252-253 



Stanley-Brown, Joseph, Editor's report 



bv 501-502 



—.elected Editor 503 



