598 



BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Page 

 Hornblende rocks, Manhattan island, Para- 

 genesis of minerals in 493-494 



— — of Westchester county, New York, 



Features of 480-483 



— schist, Graphic analysis of 466-468 



Manhattan island. Apophyses of, in 



gneisses i 470-474 



, Chemical composition of 438-439 



, Contact alteration by 474-477 



, Derivation of, hypothesis con- 

 cerning 446-448 



— , Dike-like extension of outcrops 



of 468-470 



, 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 



— schists. Analyses of. 439, 447, 448, 458, 459 



, Derivation of. Hypotheses concern- 

 ing 455-480 



in Appalachian belt, Occurrence and 



character of. 485-486 



, Origin of, Need of information con- 

 cerning 422 



Hornblende, Secondary, Development of, 

 in hornblende schist of Manhattan is- 

 land 444-446 



HoENBLENDiTE, Analysis of 448 



— , New Rochelle, New York, Microscopic 

 features of 481 



HuALALEi mountain, Hawaii, Elevation of... 6 



Hudson river, Palisade trap of, Observations 

 of grain of 371-374 



channel. Submarine extension of,. 209-210 



214 



vallev, New York, Mastodon remains 



in \ 537 



— schist, Basic dikes in 428 



, Character and thickness of. 423 



Hull, Edward, cited on submarine valleys 



in the north Atlantic 208, 220 



HuLLiAN submerged bay, off Newfoundland, 



Location of 215 



HuMMELLSTOWN (Pennsylvania) quadrangle, 



Topographic features of 28tt-287 



Humphreys, A. N., cited on clastic dikes in 



coal beds of Pennsylvania 261 



HuNTSviLLE, Alabama, Carboniferous rocks 



near 76 



Hyatt, Alpheus, Bibliography of. 509-512 



— , Death of, reported by Secretary 497 



— , Memoir of, by W. O. Crosby 504-512 



Hydrous anthophyllite. Analyses of 490 



Iceland, Submarine valleys near 219 



Ichthyosaurus, Trias.'^ic, Primitive charac- 

 ters of 536 



Idaho, Artesian wells near Enterprise, 



in 549-550 



— , Recent volcanic craters in. Character of.. 549 

 Iddings, J. P., Chemical composition of igne- 

 ous rocks expressed by means of dia- 

 grams [abstract] ." 533 



— , cited on hornblende schist of Manhattan 

 island. New York 432 



— -- — micaceous gneiss of Manhattan 



island 425 



— , quoted on micaceous gneiss of Manhat- 

 tan island 426 



— , Record of remarks by 534 



— and others. Title of paper by 533 



Iddings butte and dike, Leucite hills. Loca- 

 tion of. 322 



Page 



Iddings butte and dike. Rock of 322 



Igneous intrusives. Studies of the grain 



of 369-384 



— rocks, Chemical composition of, ex- 

 pressed by means of diagrams 533 



, Curves of cooling of. 380-382 



grain of. 383-384 



, Grain of, Application of theory of cool- 

 ing to 389-390 



— , Formulse for 402-404 



, Marginal temperature of, at time of 



intrusion 390-391 



, Phenocrysts in, Conceivable classes 



of 386-389 



India, Clastic diites in 2.59-26« 



Indiana, Clastic dikes in coal fields of. 265 



glacial deposits of 266 



— , Loess-covered aqueous deposits of 170 



till plains in 169 



— , Marl-loess in, Distribution and thickness 



of 154, 157-158 



— , Stratified exposures of 160 



, Fossils from 160-162 



— , Silt flats in 170 



— , Silted divides in 170-171 



— , Sketch map of southeastern part of. 155 



Indian Territory, Clastic dikes in 267 



— , Coal Measures in, Stratigraphic position 



of 198 



— , Sketch map of lithologic divisions of 



Carboniferous and Permian of. 197 



Interior plateau, British Columbia, Char- 

 acter, elevation, and extent of 12V-123 



Intrusives, Igneous, Studies of the grain 



of... 369-384 



— . See also Igneous rocks. 



Investments for publication fund. Report 



on, by Treasurer 499 



Inwood limestone. Character and thickness 



of 423 



Irving, R. D., quoted on clastic dilies on 



shores of lake Superior 261 



Isle Royal, Augite of greenstone ophite of, 



Grain of. .369-371 



Ithaca, New York, Devonian section at 177 



Iowa, Clastic dikes in Coal Measures of 263 



— , Glacial stages in 138 



— , Modified drift in 559-560 



lowAN epoch, Existence of man during.. 149-150 



Jacobs creek, Pennsylvania, Mauch Chunk 



formation at 51 



, Section on 51 



Jamestown, New York, Devonian section at. 177 

 Jennings, Name, Use of, instead of Che- 

 mung 43 



Jordan volcanic craters, Oregon, Character 



of 549 



Jouet, C. H., Analyses by 426, 439 



Journal of Geology, Abstracts of papers 



published in 563,564, 565 



Joy, C. a.. Analysis by 490 



Jukes, J. B., cited on origin of hornblende 



schist from basaltic ash 448 



JuLiEN, A. A. ; Genesis of the amphibole 

 schists and serpentines of Manhattan 



island. New York 421-494 



— , Title of paper by 558 



Juniata valley, Pennsylvania, Peneplain 

 remnants in 291 



Kansan glacial stage. Time since '[^Q 



Kansas, Meteorites from 6 



-, Valley loess in. Deposition of. 659-560 



Keener sand, Stratigraphic place and thick- 

 ness of 31-32 



Keith, Arthur, cited on the Harrisbnrg 



peneplain 288, 289 



Pennington shale in Tennessee... 72 



