INDEX 



469 



Deposition, causes of, 171. 



by glaciers, 208. 



by ground water, 119. 

 Deposits, coral, 259. 



character of, 256. 



Cretaceous, 420, 423. 



Jurassic, 407. 



in lakes, 268. 



land-derived, 255. 



organic, 258. 



Tertiary, 433, 435. 

 Deserts in Triassic period, 397. 

 Devonian period, fishes, 365, 367. 



land life, 368. 



mollusks, 364. 



in the East, 359. 



sea life, 361. 



in the West, 359. 

 Diastrophism, 11. 

 Diatom ooze, 259. 

 Dike, porphyry, 50. 

 Dikes, diagram of, 58. 

 Dinosaur, 409, 410, 425. 

 Diorite, 29, 30. 

 Dip, 66. 



Distributaries, 173. 

 Divide, 141. 



shifting, 156. 

 Dolerite, 29. 

 Dolomite, 39. 

 Downthrow, 72. 

 Drainage basin, 142. 

 Drift, 17, 204, 217. 



unstratified, 205. 

 Drumlin, 212. 

 Dunes, 95, 97, 98. 

 Dust, volcanic, 33 ; 

 Dust wells, 201. 



Earth, crust of, 61. 



history of, 289. 



origin of, 308. 

 Echinoderms, 297. 

 Echinoids, 297, 423. 

 Effect of ice sheets on land, 451. 

 Elements, chemical, 19. 

 Eocene epoch, 433. 

 Eohippus, 444. 



Eolian sandstone, 98. 

 Eolian soil, 17. 

 Epicontinental sea, 339. 

 Erosion, 90, 125, 155, 239. 



cycle of, 150. 



glacial, 217. 



rate of, 239. 



stream, 135. 

 Esker, 228. 



Exfoliate weathering, 101. 

 Exfoliation, 100. 

 Expansion of Ordovician sea, 339. 



Falls, 157, 161. 



consequent, 159, 



subsequent, 159. 

 Fan, 187. 



alluvial, 176. 

 Faulted mountains, 276. 

 Faults, 70. 



horizontal, 74. 



normal, 71, 73. 



reversed, 71, 72, 73. 

 Feeding grounds, 196. 

 Feldspathic rocks, 29. 

 Feldspars, 21. 

 Felsite, 29. 

 Ferns, 293, 383. 

 Fiord, 224. 

 Fishes, 300. 



Devonian, 365, 367. 

 Fissility, 70, 72. 

 Fissures, 47. 

 Flint, 39. 



Flood plain, 176, 182. 

 Flood-plain lakes, 179. 

 Flood tide, 236. 

 Flowage, zone of, 78. 

 Folded mountains, 153, 277. 

 Folded strata, 67. 

 Folds, 66-70. 

 Formation, 54. 



Niagara, 351. 

 Fossiliferous slate, 44. 

 Fossils, 16, 291, 302. 



of Proterozoic era, 329. 



Silurian, 354. 

 Fractures, 70-75. 



