INDEX. 



621 



Triassic Period, plant life of, 

 iii, 38 



transition faunas of, iii, 49 

 Triassic plesiosaurians, iii, 45 



pteridophytes, iii, 38 



pythonomorphs, iii, 43 



reptiles, iii, 42 



sauropterygians, iii, 45 



sigillarias, iii, 39 



sponges, iii, 57 



starfishes, iii, 57 

 Triassic System, Africa, iii, 38 



alabaster of, iii, 34 



Asia, iii, 37 



Australia, iii, 38 



coal-beds of, in Virginia, iii, 17 



eastern United States, iii, 2 



England, iii, 33 



Europe, iii, 30, 35 



general provinces of, iii, 38 



Germany, iii, 31 



gypsum of, iii, 25, 29, 34, 35 



interior, thickness of, iii, 27 



map of, iii, 3 



Pacific slope, iii, 27 



Red Beds of, iii, 25 



relation to Jurassic, iii, 47 



relation to Permian, iii, 47 



Russia, iii, 34 



salt of, iii, 25, 29, 34, 35 



South America, iii, 37 



Sweden, iii, 34 



West, iii, 24 

 Triassic terebratuloids, iii, 57 



thalattosaurians, iii, 45 



turtles, iii, 43 



Upper, faunas, iii, 55 

 Tributaries, development of, i, 78 



position of, 1, 79 



topographic adjustment of, i, 

 197 

 Triceratops, iii, 176 



prorsus, iii, 177 

 Trigonia, iii, 82, 91, 135, 187 



emaryi, iii, 135 



eufaulensis, iii, 187 



navis, iii, 83 

 Trigonocarpus, Mississippian, ii, 



537 

 Trilobites, Cambrian, ii, 281, 297 



Carboniferous, ii, 616, 618 



Devonian, ii, 467, 477 



Genevieve, ii, 533 



Hamilton, ii, 473 



Helderbergian, ii, 456 



Kinderhook, ii, 520, 521 



Mississippian, ii, 525 



Ordovician, ii, 347, 340 



Oriskany, ii, 459 



Silurian, ii, 403, 408 



Upper Cambrian, ii, 300 

 Trimerella, ii, 404 



acuminata, ii, 403 



ohioensis, ii, 403 

 Trinacromeron osborni, iii, 181 

 Trinidad formation, iii, 153, 154, 



206 

 Trinity series, Texas, iii, 116 

 Trinucleus concentricus, ii, 367 

 ornatus, ii, 349 



Trionychia, iii, 178 

 Tripoli, i, 661; iii, 260 

 Tripolite, i, 426 

 Tritia, iii, 294, 295 

 Tritonhdae, iii, 295 

 Trocholites ammonius, ii, 352 

 Trochus, sp., iii, 135 



saratogensis, ii, 284 

 Troostocrinus reinwardtii, ii, 403 

 Tropidoleptus carinatus, ii, 471, 



472, 478 

 Tropites subbullatus, iii, 51 

 Tropitidae, ii, 655 ; iii, 50 

 Trout creek, i, 193 

 Truckee Miocene, iii, 266 

 Truncatulina lobatula, iii, 241 

 Tschermak, G., cited, i, 538; ii, 



27, 28 

 Tschernyschew. T., cited, ii, 391 

 Tufa, see Tuffs 

 Tufa cones, i, 611 



deposits, i, 611 

 Tuffs, i, 404, 434, 473 

 Tuicla, iii, 294 



Tullahoma formation, iii, 552 

 Tully limestone, ii, 432, 477 

 Turbo, iii, 91 



moyonensis, iii, 136 

 Turkestan, loess of, iii, 407 



Pennsylvanian of, ii, 589 



Pleistocene of, iii, 424 

 Turner, H. W., cited, iii, 122, 

 160, 263, 265, 267, 475; 

 (and Lindgren), 317 

 Turrilites, iii, 134 

 Turritella, iii, 134, 295 



budaensis, iii, 135 



mortoni, iii, 243 



variabilis, iii, 294 

 Turtles, Cretaceous, iii, 178 



Jurassic, iii, 100 



marine,Cretaceous,iii,i8o,i85 



Triassic, iii, 43 

 Tuscaloosa series, iii, in, 112, 

 114 



thickness of, iii, 115 

 Tuscarora deep, i, 548 

 Tuscarora quartzite, iii, 548 

 Two Medicine River, i, 154, 157 

 Tyler slate, ii, 186, 189 

 Tyndall, J., (and Huxley,) cited, 



i, 322 

 Typotheria, iii, 321 

 Tyrrell, J„ B., cited, ii, 426; 

 iii, 152, 236, 332, 362, 368 



Undina gulo, iii, 88 

 Unguiculata, iii, 230 

 Ungulata, iii, 230 

 Unicoi formation, ii, 152 

 Unio douglassi, iii, 134 



farri, iii, 134 

 United States Geological Survey, 



i, 32 

 Unkar formation, iii, 574 

 Unkpapa sandstone, iii, 68, 566 

 Upham, W., cited, i, 388; iii, 



361,367.370,303.402, 403, 



411,415 424,481,482, 516, 



521 



Upper Aubrey formation, iii, 3 13, 



574 

 Upper Barren Coal Measures, ii, 



542 

 Upper Burlington limestone, ii, 



56i 

 Upper Cambrian, ii, 225 

 annelids, ii, 299 

 brachiopods, ii, 299, 300 

 cephalopods, ii, 299 

 corals, ii, 299 

 cystids, ii, 299 

 gastropods, ii, 299, 300 

 pelecypods, ii, 299 

 trilobites, ii, 299, 300 

 Upper Devonian, ii, 430 



map, ii, 431 

 Upper Forestian epoch, iii, 421 

 Upper Permian, gypsum in, ii, 

 630 

 salt beds of, ii, 630 

 Upper Productive Coal Measures, 



", 54i 

 Upper Silurian, ii, 368; (see 



also Silurian) 

 Upper Triassic faunas, iii, 55 

 Upper Turbarian epoch, iii, 421 

 Uprooting of trees, i, 40 

 Upshur sandstone, iii, 548 

 Uralite, i, 431 

 Uruguay river, sediment carried 



by, i, 107 

 Usiglio, cited, i, 375; ii, 661 

 Utica shale, ii, 310; iii, 553. 555. 



557 

 Uvigerina, iii, 294 



Vaginalina legumen, iii, 241 

 Valley trains, iii, 371 

 Valleys, affected by folds, 1, 154 

 antecedent, see Strearrs, an- 

 tecedent 

 canoe-shaped, i, 155 

 consequent, i, 78 

 courses of, i, 77 

 development of, i, 63, 70, 73. 



80 

 hanging, i. 164, 290 

 limits of growth, i, 67 

 oldest parts, i, 76 

 profiles of, i, 66 

 relations to lakes, i, 74 

 slopes of, i, 94 

 special forms of, i, 94 

 structural, i, 77 

 struggle for existence among, 



i, 100 

 submerged, iii, 521 

 Van Hise, C. R., cited, i, 219 

 434. 448, 474. 479, 504, 

 543. 555. 57o; ii. 138, 139, 

 143, 145, 146, 149, 150, 153, 

 155. 158, 176, 178, 179. 180, 

 181, 186, 187, 188, 191,198, 

 199, 205, 206, 208, 213, 

 214, 217; (and Hoskins), ii, 

 258 

 Vanuxem, L., cited, ii, 310 

 Vanuxemia dixonensis, ii, 354 

 Vaquero formation, iii, 68, 577 



