506 INDEX. 



Page. 



Eoads and trails 439 



Eoaring Fork 56,68,86,88,422 



rate of fall of 433 



synclinal 59 



Robert Bruce lode ,... 234 



Eoche Moutonn6e Creek 80,81,83 



Eoches Moutonn6es 161,192,220 



Eock Creek ..59,61.63,65,69 



Eogers, Prof. H. D 281 



Eoubideau'a Creek 104 



Euffner, Lieut. E. H 98,99,416 



Euins at Aztec Springs 377 



in Mancos Caiion 373 



on the Hoven weep 381 



^ McElmo 378 



Eboda, Franklin, report of 451 



Ehyolite 197,204,206 



S. 



Salt Mountains , , 103 



San Cristoval Lake 203,455 



San Juan City 199 



mines 229 



Mountains 452 



Eiver , 369 



San Miguel Lake 228 



Elver 206,215,477 



rate of fall of 446 



section on 227 



Sand-bills of Nebraska 259 



Sawatch range 48,54 



revisiop of elevations of ..„ 429 



Scenery of Loess age in Nebraska 250 



Scbimper, Professor.. 279 



Sedimentary area of San Juan district 210 



Settlements 428 



Sbumard, Ur. G. D 117 



Sierra La Plata 369 



La Sal 103 



San Juan , 369 



Silurian age 110 



formation 210 



fossil flora 276 



strata in Eastern Colorado 41 



Elk Mountains 57,69 



of Eagle River 113 



section of „ , 113 



tables of comparison of 112, 114 



Silver 175 



Silverton 465 



Slate Eiver 94 



Smith's Fork of Gunnison Eiver 94, 97 



Sneffels, Mount 205,479 



ascent of 479 



Snow Mass group 65, 68 



Mountain 55,66,418 



SoprisPeak 55,66,41 



geology of 61 



Special report on Mollusca 389 



Strata, sections of, 30, 31, 33, 34, 38, 102, 113, 115, 116, 118, 119, 122, 125, 126, 127, 130, 131, 



132, 133, 134, 136, 137, 138, 156, 169, 227 



Sultan Mountain 207,217 



Superficial deposits of Nebraska 243 



fuel from 262 



Swallow and Hawn on Permian strata 117 



T. 



Table of analyses of coal 177 



Bear Eiver group 144 



Bitter Creek series 145 



