892 



INDEX. 



Page. 



Shales, occurrence of 8, 15 



Shoshonite, analyses of 83, 340 



character and occurrence of 339-347 



photomicrographs of 344 



Silica percentages, rocks of Electric Peak 116-118 



Slough Creek, topography and geology of valley of. 208-210 



Spirifer albapinensis 489, 548, 594 



Spirifer argentarius 550 



Spirifer ' r Meatus 548 



Spir'fe- cameratus 540 



Spirifer carteri Hall 55S 



Spirifer centronata Hall and Whitfield 489, 547 



Spirifer centronatua Winchell 488, 



489, 540, 547-549, 550, 552, 594 



Spirifer centronatus var. seniifurcatus 549-550, 594 



Spirifer cuspi'datus Meek 559 



Spirifer (Cyrtia) hannibalensis Swallow 558 



Spirifer engelmanni Meek 504, 580 



Spirifer ex tenuatus 488 



Spirifer forbesi 553 



Spirifer hirtus White and Whitfeld 555 



Spirifer lamellosus L6veille 56L 



Spirifer marionensis Shumard (?) 551 



Spirifer (Martinia) glaber Martin 554 



Spirifer (Martinia) peculiaris White 488-557 



Spirifer mesicostalis 549 



Spiiifer ( ?) peculiaris Shumard 557 



Spirifer setigera 489 



Spirifer sp 552-553, 594 



Spirifer sp 553 



Spirifer striatus White 488 



Spirferstriatus var. madisonensis n. var. 488, 551-552, 594 



Spirifer subattenuatus Hall 492, 550 



Spirifer (Syringotliyris) cuspidatua 59S 



Spirifera albapinensis 489 



Spirifera cooperensis Swallow 555 



Spirifera setigera H. and W 556 



Spirifera subrotundata Hall 557,558 



Spiriferina solidorostris Herrick 546, 599 



Spiriferinasolidorostris White 545-547,595 



Spirigera euzona 565 



Spirigera formosa 565 



Spirigera monticola 488 



Spirigera obinaxima 488 



Sphenopteris guy ottii Lx 655 



Square Butte, Montana, analyses of igneous rocks 



from 354 



Stanton, T. W., fossils identified by 193 



Stellaria Creek, rocks on 45. 46 



Stelzner, A., cited 140 



Sterculiacepe 742 



Stinkingwater River, dike rocks of 347,350 



nature of rocks at 340, 345 



Stock rocks, characters of 97-103 



Straparollus utahensis Hall and Whitfield. . 489, 573-574, 



5S1 



Streptorhynchus a?quivalvis 522 



Streptorhynchus equivalvis 522 



Streptorhynchus insequalia 522 



Streptorhynchus intlatus 4S9 



Streptorhynchus kcokuk 524 



Strictoporella ( ?) 518 



Strophomera rhomhoidalis White 488,489,525 



Survey Peak, rocks of 159-160 



section at 160 



Sylvan Pass, dikes and flows near 304-314 



Syringopora aculeatan. sp 509, 5S4 



Page. 



Syringopora surcularia n. sp 510, 5S4 



Syringotliyris carteri Hall 488, 492, 558-559, 59$ 



Syriugothyris cuspidatus Walcott 559 



Syringotliyris extenuatus 488,559 



Syringothyris typa Winchell 558 



T. 



Tancredia ( ?) knowltoni n.sp 621, €44 



Tapes wyomingensis Meek 638 



Taxitis olriki Hess 680, S04 



Terebratula (Dielasma) burlingtonensis .. 488 



Terebratula gorbyi S. A.Miller 545 



Terebratula niarcyi Shumard 561 



Terebratula michelina 521 



Terebratula utah Hall and Whitfield 489,544 



Tertiary flora, biological consideration of 773-783 



description of plants of 665-791 



geological consideration of 783-981 



table showing distribution of 749 



plates showing plants of 793SS2 



Teton Range, crystalline schists of 152-157 



descriptive geology of northern end of 149-164 



map of northern end of 150 



sedimentary rocks of 150 



topographic features of 151-152 



volcanic rocks of 157, 161-162 



Tetranthera dealbata R. Br 726 



Tetranthera sessiliflora Lx 659 



Theca gregaria 454 



Theca primordialis Hall 454 



Theca (Pugiuiiculiis) gregaria M. and H 454 



Thracia ( ?) montanaensis (Meek) ? 628, 644 



Thracia weedi n. sp 627, 64$ 



Three Kiver Peak, features of 23-24 



rocks of 16 



section of 23 



view of 24 



Thunderer (The) and Mount Norris, view of 222 



Tilia populifolia Lx 743 



Tiiatiiferous iron ore, occurrence of 400-401 



Tower Falls, basalt at 434-135 



Trachytic rhyolite, occurrence of 321-328 



Trapa ? microphylla Lx 661,754 



Triassic fossils 197. 600-601, 608 



Trilobite Point, rocks of 11-12 



zone of contact between intruded sheet and coun- 

 try rock near 69 



Trigonia americaua Meek 618-619, 619 



Trigonia costata 619 



Trigonia elegant issima Meek 619, 644 



Trigonia montanaensis Meek 619-620 



Tuff (andeaitic), occurrence of 4 



Tuff-breccia, andesitic, occurrence of 56 



Turritella sp 630 



Two Ocean Pass, analysis of rocks from 329 



character of lava at 340,343 



chemical composition of rocks from 329, 337 - 



Two Ocean Plateau, rocks of 258-300 



topography and geology of 200-202 



Typhacea?, descriptions of species of 683 



XJ. 



Ulmacese, descriptions of species of 711-712 



Ulmus, fruits of 712, 816 



Ulmus minima? Ward 711 



Ulmus pst'udo fulva? Lx 71I,5i6 



