564 



INDEX. 



Page. 



Quartzite, white mica in 474 



Quartzites, interbedded, origin of 92 



of the Dakota 170 



ofthePotsdam 89 



Radiated zeolite 515 



Bain-fall, amount of '. - 308 



distribution of 305 



frequency of 306 



of the northern plains 309 



Rapid Creek [64] 479 



[65], [671, [09] 480 



[73] 471, 473 



[74] 481 



[202], [203] 475 



prospecting on 267, 271, 291 



terraces on 291 



topography of 269 



trachyte on - 268 



Rawhide Butte 26 



Raynolds, General "W. F., exploration by 6, 12 



RedBedclays 133 



Red Beds, absence of fossils in the 138 



age of 150 



and Carboniferous, separation of 110, 113, 131 



igneous peaks 145, 197, 198 



Jura, separation of 131, 153 



coloration of the 138 



exposures in detail 139, 155 



in Belle Fourche Valley 147 



near Camp Jenney 155 



of the Black Hills 42 



Rocky Mountains 148 



on Amphibious Creek 141 



Beaver Creek 139 



Rapid Creek 143 



Red Canon Creek 140 



Red "Water Creek 145 



Red Canon Creek [207] 472,474 



prospecting on 236 



Red Valley - 32,42,135,142,204 



Reeves, R.J 554 



Report, preliminary 4, 21 



Reservation, Sioux 4 



Resources, mineral 225 



other than mineral 311 



Rhynchonella gnathophora 34" 



myrina 347 



Rhyolite 192,194,195,203 



[101] 494 



[109] 495 



[120] 496 



[125] 499 



[127] 500 



[131], [134] 501 



[135] 502 



[137] 503 



[141,142] .... 506 



[147] 508 



[152] 511 



|166] 514 



[192] 523 



|214j 524 



banded groundmass of 484 



biotite in 488 



Page. 



Rhyolite, chalcedony in 522, 523 



character described 484 



felsitic 522 



fluid inclusions in 487 



granitic 494 



groundmass of 484, 488 



groups of 527 



hornblende in 495,496 



hyaline 485 



magnetite in 488 



opal in 522 



plagioclase in 487, 507 



quartz in 486 



sanidin in 487, 506 



silica, percentage of 485 



trachyte and phonolite 483 



varieties of ." 486 



Rhyolitic breccia 516 



Ricketts, Dr. P. de P., analysis of greensands 96 



cited 133, 134, 275 



gold assays by 294 



Rocks of the Black Hills, tabulated 40 



Rose quartz 70 



Rostellaria fusiformis 421 



nebrascensis 429 



Routes to and from Black Hills, geology of - 22 



Sandstone 472, 474 



cement in 474 



glauconitic 475 



Sanidin, apatite in 512 



broken crystals of 490, 512 



characteristic 509 



glass inclusions in 518 



inclusions in 489 



inpbonolite 492 



rhyolite 487, 506 



trachyte 489 



microlites in 507 



twin crystals of 490 



zone structure of 509, 511, 512 



Sanidin-oligoclase-trachyte 483, 492, 507 



Sanidin-trachyte 483 



[113] 496 



[123] 497 



[124] 498 



[140] 505 



[149] 509 



[150], [151] 510 



[157] 512 



[159-162] 513 



[167, 168] 515 



[171] 517 



[173] 518 



[175] 520 



[178] 521 



[2131 523 



Saxicava Jurassica 376 



Scaphites conradi 464 



larvaeformis 464 



nodosns 441 



var. brevis 443 



plenus 444 



quadrangnlaris 443 



pulcherrimus 464 



