INDEX 



7*5 



Springs, constant and intermittent, 64. 



mineral matter contained in, 64-66. 



origin of, 62-64. 



temperature of, 66. 



thermal, 66. 

 Squalodonta, 597. 

 Stabler, Dole and, 83. 

 Stacks, 211. 

 Stalactites, 71, 72. 

 Stalagmites, 71, 72. 

 Starfish, Devonian, 457. 



Mesozoic, 526. 



Ordovician, 431. 

 Staunton, Va., swallow holes of, 69. 

 Stegocephalians, 486-489, 536. 

 Stegodon, 614. 

 Stegosaurus, 546-548. 

 Stenotheca rugosa, 413. 

 Stigmaria, 495. 

 Stocks, 327-328. 

 Stopes, M., 498. 

 Stoping, 337. 

 Storm waves, force of, 200. 



height of, 201. 

 Stoss side, 158, 183. 

 Stratification, 24, 233-234. 

 Stratified drift, 160, 178-182. 

 Stratigraphy, definition of, 22. 

 Stream deposits, characteristics of, 130. 

 Stream erosion, cycle of, 109-1 14. 



features due to, 89-114. 

 Stream piracy, 102, 107-109. 

 Streams, sea-captured, 214. 



sediment of, 81. 

 Streptelasma (Enterolasma) calicula, 

 444. 



profundum, 429. 

 Streptis grayi, 446. 

 Striations, glacial, 157, 183. 

 Strike, 252. 

 Stromatopora, Ordovician, 429. 



Silurian, 445. 

 Stromboli, 339. 

 Stropheodonta demissa, 458. 

 Strophomena rugosa, 432. 

 Strophostylus cyclostomus, 447. 



expansus, 459. 

 Structural adjustment, 102. 

 Structural geology, definition of, 21. 

 Structural valleys, 100. 

 Strutt, 274. 

 Stylonurus, 461. 

 Subaftonian stage, 649. 



Subcrust theory of interior of the earth, 



Subglacial material, 156. 



Subjacent igneous rock, 327-328. 



Submarginal moraines, 161. 



Submarine delta, see Continental shelf. 



Submarine earthquakes, 282. 



Submerged streams, 227. 



Submerged valleys, 195. 



Submergence, 226. 



Subsequent streams, 100-102. 



Subsequent valleys, 1 16. 



Subsoil, 42. 



Suez Canal, 50. 



Sumatra, earthquake of, 281. 



Sumbawa, volcano, 298. 



Sun cracks, 236, 238. 



Superglacial debris, 150, 154-156. 



Superposition, order of, 381. 



Surface moraines, 154-155. 



Swallow holes, 69. 



Swamps, conditions for, 472. 



Swine, 619. 



Syenite, 330. 



Synclines, 254, 363. 



Synclinorium, 256. 



Syndyoceras, 619. 



Synechodus, 534. 



Syringopora, 445, 456. 



Syringopora retiformis, 444. 



Taconic deformation, 422. 



Talc, 690. 



Talus, angle of slope, 30. 



damming lake, 39. 



in arid regions, 33. 



origin of, 29. 

 Tapirs, 607-608. 

 Tarr, R. S., 179, 648. 

 Taylor, F. B., 652. 

 Teleoceros, 607. 

 Teleosts, 535. 



Temnocheilus forbesianus, 483. 

 Temperature and the disintegration of 

 rocks, 31. 



of ocean, 196-197. 



of springs, 66. 

 Temperature, changes in daily, 31. 

 Tentaculites gyracanthus, 447. 

 Terabratula humboldtensis, 526. 

 Terminal moraines, 159-160, 175. 

 Terraces, alluvial, 127. 



