716 



INDEX 



Terraces — {Continued} 



discontinuity of, 129. 



marine, 211-212. 



of glacial origin, 179. 



rock, 128. 

 Tertiary period, 572-642. 



changes at close of, 643-644. 



climate of, 634-636. 



duration of, 642. 



effect of isolation and migration during, 

 636-642. 



life of, 590-634. 



physical geography of, 574-590. 



vegetation of, 630-634. 

 Tetrabelodon, 614. 

 Tetracoralla, 524. 

 Tetragraptus, 428, 429. 

 Tetragraptus fructicosus, 428. 

 Thalattosuchia, 552. 

 Thaleops ovata, 435. 

 Thalweg, 63. 



Thames, dissolved minerals in, 83. 

 Thamnastraea prolifera, 524. 

 Thecosmilia trichotoma, 524. 

 Thelodus, 450. 

 Thermal springs, 66. 

 Theromorphs, 536-539. 

 Theropoda, 539. 

 Thompson, J., 191. 

 Throw, 262. 

 Thrust faults, 263-264. 

 Tidal bores, 202. 

 Tidal currents, 201, 218. 

 Tidal scour, 202. 

 Tides, 201. 

 Tied islands, 223. 

 Till, 160, 172, 173. 



Tillamook Rock, storm waves at, 201. 

 Tillotherium, 621. 

 Titanotheres, 603-605. 

 Tivoli, lime deposits of, 65. 

 Topography, mature, no. 



youthful, 109. 

 Top-set beds, 131. 

 Tornoceras mithras, 459. 

 Torosaurus, 548. 

 Trachodon, 544, 545, 546, 572. 

 Transportation, and velocity of streams, 

 82, 86. 



by marine currents, 219-224. 

 Travertine, 249. 

 Travertine dams, 65. 



cause falls, 93, 94. 



Trematis ottawaensis, 432. 

 Trematonotus alpheus, 447. 

 Trenton formation, 422. 

 Trenton stage, 422, 423. 

 Triassic period, 508-512. 



climate of, 569-570. 



in other continents, 511. . 



of Atlantic and Gulf coasts, 508-511. 



of Pacific coast, 511. 



of western interior, 511. 



physical geography of, 508-512. 



volcanic activity of, 511. 

 Tribes Hill stage, 422. 

 Triceratops, 547-549, 572. 

 Trigonia clavellata, 527. 

 Trigonolestes, 616. 

 Trilobites, Cambrian, 402, 410-413. 



Carboniferous, 481, 484. 



Devonian, 460. 



Ordovician, 435-436. 



Silurian, 448-449. 

 Trinity formation, 515. 

 Trinucleus (Cryptolithus) tessallatus, 



435- 

 Trochoceras desplainense, 448. 

 Trocholites ammonius, 434. 

 Trochonema umbilicatum, 434. 

 Trochus saratogensis, 413. 

 Troostocrinus reinwardti, 446. 

 Tropidoleptus carinatus, 458. 

 Tropites subbullatus, 529. 

 Tsientang River, bores in, 202. 

 Tsunamis, 292. 



Tuckasegee and Davidson rivers con- 

 trasted, 98. 

 TufF, 332. 

 Tully stage, 452. 

 Turrilites, 530. 

 Turrilites catenatus, 529. 

 Turritella humerosa, 628. 



mortoni, 379, 628. 



variabilis, 628. 

 Turtles, Mesozoic, 557. 



Tertiary, 624. 

 Tyndall, J., 190. 

 Tyrannosaurus, 540, 572. 



Uintacrinus, 524. 

 Uinta Mountains, 356. 

 Ulrich, E. O., 408. 



Uncompahgre River, contrasted with Gun- 

 nison, 114. 



