I 



564 



INDEX. 



Page. 



Quartzite, white mica in 474 



Quart2it»'8, int(Tbi<ltle<l, ori^ of 92 



oftboDiUioU 170 



ofthe Potsdam 89 



liatliated zeolito 515 



Ilain-fall, amoiiDt of 308 



distribution of > 305 



frc(]iicncy of 306 



of tbe nortbian plains 309 



Rapid Creek (C4J 479 



[C:.], [07], [03] 480 



[73] 471,473 



[74] 481 



[202], [203] 475 



prospecting on 267, 271, 291 



terraces on 291 



topography of 269 



trachyte on 268 



Rawhide liutto 26 



Raynolds, General W. R, exploration by 6, 12 



Red Bed clays 133 



Red Beds, absence of fossils in tho 138 



ago of 150 



and Car\)oniferous, separation of 110, 113, 131 



igneous peaks 145, 197, 198 



Jura, separation of 131, 153 



coloration of tho 138 



exposures in detail 139, 155 



in Belle Fourche Valley 147 



near Camp Jenne y 155 



of tho Black HiUs 42 



Rocky Mountains 148 



on Amphibious Creek 141 



BeavcrCreek 139 



Rapid Creek 143 



Red Caiion Creek 140 



Red Water Creek 145 



Red Cr.uon Creek [207] 472,474 



prospecting on 236 



RedValley 32,42,135,142,204 



Reeves, R, J 554 



Report, preliminary 4, 21 



Reservation, Sioux 4 



Resources, mineral 225 



other than mineral 311 



Rbynchonella gnathophora 347 



myrina 347 



RhyoUte 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 



I ICO] 514 



[192] 523 



|214j 524 



banded groundmass of 484 



biotit«in . 488 



Page. 



Rhyolit*-, chalcedony in _. 522,523 



character described 484 



feUitic 522 



lluid inclusions in 487 



granitic 494 



groundmass of 484, 488 



groups of 527 



hornblende in 495, 496 



hyaline 485 



magnetite in 488 



opal in 522 



pbigioclase in . 487,507 



quartz in 486 



sanidin in 487, 506 



silica, percentage of 485 



trachyte and phonolite '483 



varieties of 486 



Ehyolitic breccia 516 



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



cited 133,134,275 



gold assays by 294 



Rocks of tho Black HilU, tabulated 40 



Rose quartz 70 



Rostellaria fusiformis 421 



nebrasccnsis 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 



Inpliouolite 492 



rhyolitc 487,506 



trachyte 489 



microlites in 507 



twin crystals of 490 



zone structure of 509, 511, 512 



Sanidin-oligoclase-trach j-te 483, 492, 507 



Sanidin-trachyte 483 



[113] 496 



[123] 497 



[134] 498 



[140] 505 



[149] 509 



[150], [151] 510 



[157] 512 



[159-1C2] 513 



[167,168] 515 



[171] 517 



[173] 51R 



[175] 520 



[178] 521 



[213] 523 



Saxioava Jarassica 376 



Scaphites cflnradi 464 



larva?formis 464 



nodosns 441 



var. brevis 443 



plenus 444 



quadrangnlaris 443 



pulcherrimus 464 



