560 



INDEX. 



Pago. 



I''u8uii choycnnensls 424 



constrictQS 403 



contortus 422 



culbcrtHoni 423 



baydc-ui 423 



sbiiiuardi 424 



tcnuilineatus 4C3 



Ga]t'ua 01 



Gamopctalso 534 



Garnet in bomblcndo-gncisa 479 



quartzifo 472,474 



GaiTjols 52 



Gcolofrical liistory of tho BIa«k Hills 296 



Gcrvillia rct-f a 358 



Glacial period, gravels of 298 



Gladiua obey cnncnsis 421 



Glass inclusions 510 



in sanidin 495, SIS 



mass 506 



Glauconito 95, 475, 47C 



analyses of 96 



Glauconitic limestone 475 



sandstone 475 



Gneiss 53 



Gold, ago of 296 



character of 235, 237, 249, 254, 265 



derived from the Potsdam conglomerate 299 



trachyte 282 



discovery of 229, 204, 292 



in tbc Bear Lodge range 286 



manner of occuiTcuce of 225 



quartz 286 



source of 64, 61, 84, 103, 200 



ledge, Warren Peak [187] 522 



Goniochcilus castorensis 427 



Grammatodon inornatus 359 



Granite 41 



blocks included in 72 



character of 69 



composition of 228 



distribution of 54, 05 



intrusive character of 229 



lenticular form of, masses 73 



of Kawhide Butte 27 



theBbick Hills, ago of 77 



intrusive 70 



origin of 75 



l)cbbles In base of Potsdam 79 



White Kiver conglomerate 214 



relation to schists 72 



relations of, compared with those of trachyte . 78 



slickensides on 228 



structure of 71 



topography of 05,227 



Granite-porpbjTy 484,495 



Graphite 54 



Grass, character of 317 



Gravels, placer 287, 242 



Quaternary 298 



Gray, Asa 531 



Grazing lands of tho Sioux Keservation 5 



Grccnsauds 95 



Greenstone 194 



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



Groundraass, banded 484 



Page. 



Groundmass, crypto-crystaUino 502 



crystalline '. 510,513 



febtitic 523 



fibrous 516 



nuid like etructuro of 491, 513 



isotropic 499 



microlitic 508, 515 



of phonolite 494 



rhyolite 484, 488, 491 



trachyte 491 



Groups of rhyolites and trachytes 5i7 



Grypha;a calceola var. nebracensis 348,349 



i^ongesta 462 



vesicularis 462 



Gypsum 134,138,146,295 



Gyrodcs conradi 463 



Hall, Prof James 9 



cited 97 



Hall'sCut-ofi [28] 471,472 



Hall's Water [209] 471,474 



llamiuea subcylindrica 437 



Hamites uncum 464 



Hamulus annulifer 456 



Harris, Air. Edward, exploration by 7 



Harney Peak 15, 227 



ascent of 67 



barometric observations on 547 



height of .>48 



Harney Peak range 226 



Haydcn, Dr. F. V .. 0, 31, 81, 112,151,166 



exploration by 9, 10, 12, 13, 14 



cited 38,74,96,113,131 



Helcion alveolus 433 



cariuatus 436 



patellifoi-mis 435 



subovatus 434 



Hehcoccras a.ngulatum 464 



nebrascense 451 



stevensoni 447 



Hematite 57 



on Box Elder Creek 274,295 



Heteroceras angulatum 449, 464 



newtoni 449 



? nebrascense 451 



Hinraan, Riv. S. D 230 



Hippouyx borealis 436 



Hornblende, cleavage of 472, 514 



crystals 498 



dichroitic 472, 514 



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



py rrhotite in 479 



garnet in 479 



Homblende-microlites 497, 513 



needles 521 



in i)honolite 493 



trachyte 490,519 



quartzite 472, 473 



rock 54 



Hunt,Dr.T.S 47 



analyses of glauconito 96 



cited 133 



Huronian formation, the 37 



Hutton, Mr. J. D 12 



Hyaline-rhyolite 485 



Hyolithes grogaria 460 



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