560 



INDEX. 



Page. 



Fusus cheyennensis 424 



constrictus 403 



contortus 422 



culbertsoni 423 



haydeni 423 



shumardi 424 



tenuilineatus 463 



Galena 01 



Gamopetalse 534 



Garnet in homblende-gneisa 479 



quartzite 4-72, 474 



Garnels 52 



Geological history of the Black Hills 296 



Gervillia recta 358 



Glacial period, gravels of 298 



Gladius cheyennensis . 421 



Glass inclusions '. 516 



in sanidin 495, 518 



mass 506 



Glauconite 95, 475, 470 



analyses of 90 



Glauconitic limestone 475 



sandstone 475 



Gneiss 53 



Gold.ageof 290 



character of 235, 237, 249, 254, 205 



derived from the Potsdam conglomerate 299 



trachyte 282 



discovery of 229, 264, 292 



in the Bear Lodge range 280 



manner of occurrence of 225 



quartz 236 



source of 54, 61, 84, 103, 200 



ledge, "Warren Peat [1871 922 



Goniocheilus eastorensis 427 



Grammatodon inornatus 359 



Granite 41 



blocks included in 72 



character of 69 



composition of 228 



distribution of 54, 65 



intrusive character of 229 



lenticular form of, masses 73 



of Rawhide Butte 27 



the Black Hills, age of 77 



intrusive 70 



origin of 75 



pebbles in base of Potsdam 79 



"White River conglomerate 214 



relation to schists 72 



relations of, compared with those of trachyte . 78 



slickensides on 228 



structure of 71 



topography of 65, 227 



Granite-porphyry 484, 495 



Graphite 54 



Grass, character of 317 



Gravels, placer 2«7, 242 



Quaternary 298 



Gray, Asa 531 



Grazing lands of the Sioux Reservation 5 



Greensands 95 



Greenstone 194 



Grinnell, Mr. G. B., exploration by 15 



Groundmass, banded 484 



Groundmass, crypto-crystalline 502 



crystalline 510, 513 



felsitic 523 



fibrous 516 



fluid-like structure of 491, 513 



isotropic 499 



microlitic 508, 515 



of phonolite 494 



rhyolite 484, 488, 491 



trachyte 491 



Groups of rhyolites and trachytes 5!; 7 



Gryphsea calceola var. nebracensis 348, 349 



congesta 462 



vesicularis 462 



Gypsum 134,138,146,295 



Gyrodes conradi 403 



Hall, Prof. James 9 



cited 97 



Hall's Cut-off [38] 471,472 



Hall's "Water [209] 471, 474 



Haminea subcylindrica 437 



Hamites uncum 464 



Hamulus annulifer 456 



Harris, Mr. Edward, exploration by 7 



Harney Peak 15, 227 



ascent of 67 



barometric observations on 547 



height of 548 



Harney Peak range 226 



Hayden, Dr. F. V 6, 31, 81, 112, 151, 166 



exploration by 9,10,12,13,14 



cited 38,74,96,113,131 



Helcion alveolus 433 



carinatus 436 



patelliformis 435 



subovatus 434 



Helicoeeras a.ngulatum 464 



nebrascense 451 



stevensoni 447 



Hematite 57 



on Box Elder Creek 274,295 



Heteroceras angulatum 449, 464 



newtoni 449 



? nebrascense 451 



Hinman, Rev. S. D 230 



Hipponyx borealis 436 



Hornblende, cleavage of 472, 514 



crystals 498 



dichroitic 472, 514 



Hornblende-gneiss [24] [40J 478, 479 



pyrrhotite in 479 



garnet in 479 



Hornblende-microlites 497, 513 



needles 521 



in phonolite 493 



trachyte 490, 519 



quartzite 472, 473 



rock 54 



Hunt,Dr.T.S 47 



analyses of glauconite 96 



cited 138 



Huronian formation, the 37 



Hutton, Mr. J. D 12 



Hyaline-rhyolite 485 



Hyolithes gregaria 460 



