968 
Taxoxylon, 860 
Tay, Loch, affected by winds, 392 
Tealby Series, 817 
Tectaria, 790 
Tegel of Vienna basin, 867, 877 
Teleosaurus, 776 
Telerpeton, 763 
Tellina, 863, 873, 895* 
Temnograptus, 687 
Temperature, raised by depression, 289; 
raised by rock-crushing, 290; raised by 
intrusion of erupted rock, 291 ; mode- 
rate, sufficient for mineral transforma- 
tions, 300 
Temperature, terrestrial, 45, 49, 55; dimi- 
nution of rate of increase below moun- 
tain chains, 912 ; meteorological, affected 
by ocean. currents, 426; effects of rapid 
daily or seasonal changes of, 319, 
334 
Teneriffe, Island of, 247, 255 
Tentaculites, 666, 696 
Teratosaurus, 763 
Terebra, 862 
Terebratella, 805 
Terebratula, 723*, 756, 761, 773, 775*, 784, 
805*, 859, 873 
Terebratulina, 805, 878 
Terebrirostra, 805* 
“ Terra rossa ” (see Red Earth) 
Terrace Epoch of America, 383, 900 
Terraces, marine, marking rise of land, 277 ; 
of rivers, 383, 900 
Terrain Ardennais, 658 
Terrain rhénan, 690 
Terre-a-foulon, 161 
Terrigenous marine deposits, 437 
Tertiary Systems, 835; oldest strata in, 
848 
Tetraconodon, 880 
Tetracus, 856 
Tetradium, 664 
Tetragraptus, 663* 
Tetralophodon, 880 
Tetrapterus, 846 
Teudopsis, 774 
Textilaria, 804 
Thames, annual discharge of the, 361; 
catchment basin of, 361; slope of, 
363 ; composition of water of, 365 
Thamnastrea, 773 
Thanet Beds, 844 
Theca, 650*, 666 
Thecia, 664 
Thecidium, 789, 805 
Thecodontosaurus, 763 
Thecosmilia, 773 
Thelodus, 666 
Thereutherium, 856 
Thermal springs, 347, 348 
Thickness of strata, measurement of, 
514 
Thonschiefer, 121 
INDEX. 
Thracia, 795 
“ Throw ” of faults, 526 
Thujopsis, 868 
Thun, alluvium in Lake of, 385 
Thuyites, 772, 817 
Tiber, growth of delta of, 390; landslip on 
the, 358 
Tichogonia, 866 
Tidal waves, 419; currents, 420 
Tides, 51, 52, 418 
Tiger, fossil, 881 
Tilestones, 682 
Till or boulder clay, 161, 411, 417, 888 
Tillodonts of Cretaceous time, 842 
Time-measures in geology, 5, 444 
Titaneisen, 69 
Titanite, 80 
Titanotherium, 869 
Tithonian stage, 800 
Toad, early forms of, 868 
Toadstone of Derbyshire, 738 
Toarcien, 798 
Tongrian Beds, 859, 860 
Totternhoe stone, 821 
Tourmaline, 80 
Toxaster, 804 
Toxoceras, 807, 809* 
Trachyceras, 763 
Trachyderma, 682 
Trachyte, 139; liquidity of, 224 
Trachytoid structure, 131 
Trade-winds, 13, 27 
Tragulohyus, 856 
Trail or “loess” of Thames valley, 908 
Trass, 164, 203 
Travertine, 112; formation of, 354 
Trechomys, 856 
Trees, erect in strata, 492, 495, 497 
Tremadoc Slates, 655 
Trematosaurus, 763 
Trenton Formation, 692 
Tretoceras, 676 
Triacanthodon, 783, 785* 
Triarthrella, 660 
Triassic System, 750, 759; metamorphism 
a ‘ 578, 586; basins, effacement of, 
Trichechus, 875 
Trichites, 101 
Tridymite, 66 
Trigonia, 774, 777*, 778*, 881 
Trigonocarpon, 731 
Trigonodus, 768 
Trilobites as type-fossils, 615; earliest, 
650, 664; latest, 724 
Trilophodon, 880 
Trinidad, asphalt of, 173 
Trinucleus, 664, 665*, 667 
Trionyx, 832, 846, 857 
Triplesia, 665, 669* 
Tripoli-powder, 67, 168, 461 
Trivia, 881 
Trochocyathus, 804 
