INDEX 



397 



Smith, W. S., 227. 



Smith and Verrill, 18. 



Snails, 13, 20. 



Snakes, 13, 22, 262, 273. 



Solar system, 35-36. 



Solenhofen limestone, 225, 234. 



South America, 9, 132, 168, 171, 210, 



225, 255, 306, 308, 309, 371. 

 South Dakota, 181, 190, 220, 284, 



288, 356. 

 Spain, 46, 53, 67, 132, 210, 255, 307, 



379, 380. 

 Sphaerexochus, 115. 

 Spiders, 13, 21, 175-176. 

 Spiral nebula, 37-39. 

 Spirifers, 117, 135, 156. 

 Sponges (see also Porifers), 13, 15, 



72, 91, 113-114, 133, 155, 173, 



228, 258. 

 Spy, Men of, 374, 375, 377. 

 Squids, 13, 21. 

 Stage, 31. 



Star-fishes, 13, 17, 115, 134. 

 Staurocephalus, 115. 

 Stegocephalians, 157, 178. 

 Stegosaurs, 263, 267-269. 

 Stephenson, L. W., 241, 242, 248, 



259, 286, 291-292, 314. 

 Stissing limestone, 57. 

 St. Lawrence Valley, 63, 88, 104, 144, 



299, 332, 335, 336, 348, 364. 

 St. Louis series, 143, 147; time, 148. 

 St. Marys formation, 282. 

 Stoek, H., 160. 

 Stratigraphy, defined, 23. 

 Stropheodonta, 135. 

 Submergence, of land, 28. 

 Sulphur deposits, 256. 

 Sun, 35-38. 



Superposition, order of, 7. 

 Susquehanna, River, 297. 

 Sweden, 67, 115, 368. 

 Switzerland, 132. 

 Syria, 308. 

 System, 31, 32. 



Taconic Range, 86-88, 107, 206. 

 Taconic Revolution, 86-88, 197. 



Talbot, M., figure, 271. 



Tarr, R. S., 34, 342. 



Tasmania, 68, 89, 152, 188. 



Taylor, F. B., 343, 344, 345, 346, 347. 



Taylor formation, 237, 242. 



Tejon formation, 282. 



Teleosts, 140, 232-233, 261, 316. 



Tennessee, 82, 83, 88, 90, 106, 122, 

 130, 132. 



Terebratula, 257. 



Tertiary period, 32, 281-327; origin 

 of name, 281; subdivisions, 281- 

 282; rock distribution, 283-284; 

 character of rocks, 284-291; thick- 

 ness, 290-291; igneous rocks, 291; 

 physical history, 291-304; igneous 

 activity, 303-304; foreign Eocene, 

 305-306; foreign Oligocene, 306- 

 307; foreign Miocene, 307-309; 

 foreign Pliocene, 308-309; climate, 

 309-310; economic products, 310- 

 311; life of, 311-327. 



Tetrabeledon, 324-325. 



Tetrabranchs, 13, 20, 97-99. 



Tetracoralla, 92, 191, 213. 



Tetragraptus, 92. 



Texas, 53, 58, 106, 128, 160, 169, 

 180-182, 190, 219, 242, 244, 246, 

 256, 275, 284, 287, 289, 292. 



Thallophytes, 11, 153, 170, 212. 



Theropods, 263, 270-271. 



Thibet, 305. 



Thrimax, 312. 



Till, 339. 



Time scale, geological, 31. 



Torridon sandstone, 53. 



Toxaceras, 260. 



Tracks of animals (see footprints). 



Traquair, R., 137, 139. 



Tremataspis, 138. 



Trent formation, 282. 



Trenton formation, 78, 81, 82, 90, 91. 



Triarthrus, 101. 



Triassic period, 32, 201-218; origin 

 of name, 201; subdivisions, 201; 

 rock distribution, 201-203; char- 

 acter of rocks, 203-206; thickness, 

 206; igneous rocks, 206; physical 



