INDEX 



5 6l 



High Plateaus of Utah, 316; origin of, 

 483 ; uplifts, 534. 



Hillside springs, 92* 93. 



Himalaya Mountains, 325, 496 ; origin of, 

 515 ; Pleistocene glaciers of, 536 ; rain- 

 fall of, 78. 



Hippopotamus, fossil, 522, 538. 



H ipp other ium, 517. 



Historical geology, 7, 343I". 



History, human and geological com- 

 pared, 350. 



Hoang-ho River, delta of, 142. 



" Hog-backs," 315*, 318. 



Ho/aster, 487. 



Holoptychius, 406*, 



Holostomata, 466. 



Holothuroidea, 424. 



Homalonotus, 400, 401*. 



Honduras, Triassic of, 447. 



Hoplites, 488. 



Horizontal and oblique bedding, 273. 



Hornblende, 2of, 193, 198, 199, 202, 289, 

 290, 358 ; andesite, 200 ; gneiss, 296 ; 

 granite, 198 ; schist, 297. 



Hornblendite, 202'. 



Hornfels, 289. 



Hornstone, 210, 289. 



" Horses " in coal seams, 273. 



Horses, fossil, 505, 506, 509, 517, 522, 524, 

 538. 



Horse-shoe crabs, fossil, 391, 465. 



Horsetails, Carboniferous, 420; Creta- 

 ceous, 485 ; Eocene, 502 ; Jurassic, 462 ; 

 Palaeozoic, 367 ; Triassic, 448, 449. 



Horsetown stage, 475, 478f. 



Hot-spring deposits, 130. 



Hudson River, submarine channel of, 

 68. 



Hudson stage, 375, 376^ 



Huerfano Canon, 499. 



Humous acids, their effects in decompos- 

 ing rocks, 75. 



Huronian period, 362. 



Hyaenas, fossil, 522, 538. 



Hycenodon, 508. 



Hyalite, 15. 



Hydration of minerals, 73. 



Hydraulic limestone, 213. 



Hydroid Corals, 389. 



Hydrozoa, 371. 



Hyper odapedon, 454. 



Hypersthene, 20. 

 Hypsocormus, 468*. 

 Hypothesis, Nebular, 356. 

 Hypotheses, uses of, 5. 

 Hyracotherium , 505. 

 Hyracodoti, 509, 510*. 

 Hystricomorpha, 523. 



Ibis, fossil, 503, 516. 



Ice, coast, 115; ground, 115. 



Ice-sheet, Antarctic, 108 ; Cordilleran, 



526 ; Greenland, 108 ; Laurentide, 526 ; 



Keewatin, 526; Pleistocene deposits, 



S27. 

 Icebergs, 116 ; deposits by, 158. 

 Iceland, 96. 

 Iceland spar, 22. 

 Ichthyornis, 492. 

 Ichthyosauria, 454, 469, 490. 

 Ichthyosaurus, 469*. 

 Igneous agencies, 34, 69f. 

 Igneous rocks, 188, 445; weathering of, 



74 ; veins, 279. 

 Iguanodo7i, 491. 

 Illcznus, 381, 391. 

 Illinois stage, 529, 530. 

 Ilmenite, 25f, 193. 

 Inarticulata, 373. 



Inclined folds, 239, 241*; strata, 314. 

 Indian swallows, fossil, 516. 

 Indiana-Illinois coal field, 415. 

 Infusorial earth, 214. 

 Inherited drainage, 326. 

 Initial dip, 231, 256, 257*. 

 Injection, 289. 

 Inlier, 319; faulted, 320. 

 Inoceramtis, 488, 489*. 

 Interior sea of North America, 375, 386, 



409, 410, 411. 

 Intratelluric crystals, 190. 

 Intrusive rocks, 277; sheets, 50, 280*, 



281* 282. 

 Inverted folds, 239. 

 lone stage, 512. 

 Iowa-Missouri coal field, 415. 

 Iowan stage, 529, 530. 

 Irish deer, 538. 

 Iron, colouring effects of, 25 ; deposits 



of, 130 ; minerals, 24 ; oxides, solution 



of, 75 ; pre-Cambrian, 364. 

 Iron-ore stage, 475. 



