INDEX 



571 



Strike joints, 264. 



Stringocepkalus, 402. 



Stromboli, 36, 47. 



Strom bus, 516. 



Strophomena, 382, 383*, 402. 



Structural geology, 186. 



Stylo don, 493. 



Stylotiurus, 391, 402. 



Subaerial denudation, 307. 



Submarine volcanoes, 55. 



Submerged river channels, 67, 307. 



Sub-Patagonian stage, 523. 



Subsequent streams, 326. 



Substage (stratigraphical) , 354. 



Subterranean agencies, 34. 



Sulphur Bank Springs, 130. 



Sulphuretted hydrogen, 53. 



Sun, effects of, in dynamical geology, 29 ; 



origin of, 357. 

 Sun-cracks, i82f, 226f , 227*, 228*. 

 Superimposed drainage, 326 ; rivers, 325. 

 Superposition, order of, in strata, 221, 347f. 

 Surface agencies, 71. 

 Susquehanna River, 324. 

 Sutures (of cephalopod shells), 402. 

 Swamps, deposition in, 133 ; preservation 



of fossils in, 344. 

 Swine, fossil, 509, 517. 

 Sycamores, fossil, 502, 515. 

 Syenite. 199 ; augite, 199 ; mica, 199 ; 



nepheline, 199. 

 Syenite family, 199. 

 Syenite obsidian, 199. 

 Syenitic gneiss, 296. 

 Symmetrical folds, 237*, 238^ 239*. 

 Synclinal mountains, 319, 340 ; ridges, 



318, 319; valleys, 318, 319. 

 Syncline, 235*. 

 Synclinorium, 236*. 

 System, mountain, 333 ; stratigraphical, 



354- 

 Systemodon, 505. 



Table mountains, 313, 332^ 



Tachylyte, 201. 



Taconic range, 378 ; system, 333. 



TcEniopteris , 449. 



Talc, 22. 



Talc schist, 298. 



Talus, 81, 85, I25f; blocks, 217. 



Tapirs, fossil, 505, 506, 509, 524, 538. 



Tasmania, Carboniferous of, 418. 



Taxites, 462. 



Tejon series, 496, 498t. 



Teleosaurus, 470. 



Teleosts, 490. 



Telerpeton, 454. 



Temperature, changes of, geological ef- 

 fects, 85 ; of earth's interior, 31. 



Tension joints, 264. 



Te?itaculites, 393. 



Terebratella, 488, 489*. 



Terebratula, 425, 451, 465, 488, 489*. 



Terebratulidce, 402. 



Terminal moraine, Pleistocene, 531. 



Terraces, lake, 120*, 121 ; river, 139. 



Terrestrial deposits, 124. 

 I Terrigenous deposits, 174. 



Tertiary period, 355, 495-f-. 

 i Tetrabranchiata, 374T, 402. 



Tetracoralla, 380!, 441, 450. 



Tetragonal system of crystals, 9. 



Texture (of rocks) , 46, 47-^ i89f ; amyg- 

 daloidal, 190; compact, 190; crypto- 

 crystalline, 190 ; felsitic, 190, 196 ; 

 fragmental, 190; glassy, 46, 189, 196; 

 granitoid, 190, 196; microcrystalline, 

 190; porphyritic, 47, 190, 196; pumi- 

 ceous, 189 ; scoriaceous, 45, 189 ; ves- 

 icular, 189. 



Thecidiutn, 451. 



Thecosmilia, 463. 



Theriodontia, 455. 



Thermal metamorphism, 291. 



Thermal springs, 96 ; waters, 90. 



Theromorpha, 435, 438, 455. 



Thlceodon, 493. 



Throw of fault, 244; horizontal, 244; 

 stratigraphic, 245. 



Thrust, 252* 253*, 254* ; break, 253 ; 

 erosion, 253 ; shear, 253 ; stretch, 253, 



Thrust fault, see Thrust. 



Thrusts, causes of, 258. 



Thujites, 462. 



Tidal erosion, 119. 



Tierolites, 452. 



Till, 527. 



Tillodonts, 505, 506. 



Time, geological, 352; classification of, 



354- 

 Time scale, 354. 

 Tin, 266. 



