884 



INDEX 



Page. 



Schell Creek Mountains, Cambrian 485 



Scirpns Kingii 747 



Section A— B, Map I, described 50 



II, described 229 



lY, described 608 



V, described 709,802 



C— D, Map I, described 55,129 



II, described 280 



IT, described 483, 505, 531, 555 



V, described 044,844 



(generalized) of sedimentary rocks of For- 

 tieth Parallel 855 



of Archaean, Red Creek 269 



Colorado Cretaceous 44, 156, 264 



Dakota Cretaceous 40,264 



rox Hill Cretaceous 144,154,155 



Green Kiver Eocene 219,221 



Jurassic 38,80,264,293,390 



Laramie Cretaceous 61,145,158,188 



Mesozoic strata 91, 275 



Palaeozoic strata . . .30, 343, 346, 385, 398, 405, 544, 555 



Triassio 34,265,292,303 



Truckee Miocene, Fossil Hill 766 



Upper Coal-Measures 291,599 



Vermillion Creek Eocene 212, 274 



■Wahsatch limestone. Coal Creek 604 



Weber Qaartzite, "Weber Canon 387 



Kidge, Yampa Plateau, anticlinal 285 



Permo-Carboniferous 285 

 Seetota Mountains 602 



diorite 607 



fault in "Wahsatch limestone . . 607 



feldspar-porphyry 604,606 



granite 603 



rbyolite 604 



trachyte 605 



Sedimentary formations, table of local names 855 



Seladonite 796 



Selenite in Colorado Cretaceous 156 



Separation Peak, Laramie Cretaceous 157 



Station, Laramie Cretaceous 164 



Sheep Butte described 149 



Creek, Uinta Kange, Dakota Cretaceous 261 



gypsum 262,263 



Jurassic 262,263 



trail, UintaEange. Upper Coal-Measnres 290 



Corral CaSon 837 



dacite 839 



propylite : 838 



trachyte 882,837 



Mountain, Medicine Bow Eange, gneiss 108 



Shells in drifting sands 818 



Sherman Station, altitude 5 



Shoshone Mesa 615 



lithophyssB in rbyolite 615 



rhyolito 614,615 



Pass, Augusta Jtountains, rhyolites 658 



Peak, dacite 620 



diorite C21 



glacial erosion 620 



Range 618,631 



and CaeicoPeak 618 



Archaean granite 637 



mica-schist 637 



granite 619 



Page. 



Shoshone Eange, rbyolite 023,632 



"Weber Qaartzite 619,622.631 



Springs, Augusta Mountains, Jurassic . .. 656 



Signal Peak, Havallah Range, altitude 073 



Laramie Hills, gneiss 11 



section of Palaeozoic 30 



zircon in gneiss 11 



Silicified wood, Niobrara Pliocene 71 



Silurian in'Box Elder Canon 403 



Silver Creek, Toyahe Eange, rbyolite 630 



"Wahsatch Eange, tridymite in trachyte 320 



Simpson'sEidge, altitude • 144 



anticlinal 144 



section of Fox Hill Cretaceous 1 44 



Skelligs Ridge, Elkhead Mountains, trachyte 171 



Skull Valley 462 



Slater's Fork, Elkhead Mountains, Laramie Creta- 

 ceous 188 



Slater's Fork, Elkhead Mountains, olivine in trachyte 176 



Smilax grandifolia 147 



Snowstorm Hill, Oquirrh Mountains, Carboniferous 



fossils 446 



Soapstone Canon, Uinta Range 315 



Soda Lakes, Carson Desert, described 746 



Gay-Lnssite in 749 



lifein 749 



Soil, Eeese River Valley, composition of 635 



Soldier Canon, Oquirrh MounDains, "Weber Quartzite 449 



Solidago occidentalis 747 



Sou HotSpeings 704 



Sou Spring Hills, basalt breaking through rbyolite. . 698 



rhyolite 696 



breccia 697 



Southern flanks ofthe Uista Eange 298,311 



Ef.gion, West Humboldt Eange 731 



SuosHONB Range -. 636 



Southern Shoshone Eange, A rcbEean 637 



Spanish Peak, Virginia Eange, trachyte 831 



Spaulding's Pass, Pah-Ute Eange 708 



basalt 709 



Koipato-Triaesic .. 708 



Spherical forms in basalt 618 



Split Mountain, Uinta Range, anticlinal 297 



Sporobolus asperfolius 747 



Sportsman's Creek, Colorado Eange, granite 25 



Spring Cafion, Wachoe Mountains, augite-andesite . . 480 



rhyolite 479 



Valley Pass, West Humboldt Eange 713 



Spruce Mountain, altitude C05 



diorite 510, .511 



feldspar-porphyry 510, 511 



Lower Coal-Measnres 510 



mica-schist 506 



position of ore-deposits 512 



thickness of Wahsatch limestone. 510 



wulfenite 512 



zircon in mica-schist £06 



Squaw Valley, Humboldt Pliocene 612 



Eegion 612 



Eidge, rhyolite 614 



Stansbury Island, Salt Lake, Wahsatch limestone. . . 460 



Stanton Creek, Uinta Eange, Triassic -.. 313 



Star Canon, West Humboldt Eange 719 



Peak, West Humboldt Eange, altitude 7 13 



Triassic, Augusta Mountains 651, 657 



