INDEX. 



419 



Coral reefs, barrier, 101. 



red's, fringing, 100. 



reel's, how formed, 97. 



reefs of Florida, 109. 



reefs of the Pacific, 99. 



reefs, theories of barriers and 



atolls, 103. 



Corals in Paleozoic rocks, 275. 

 Cordaites (a coal-plant named 



after Corda), 304. 

 Coryphodon (peak-tooth), 377. 

 Co-seismal lines (lines connecting 

 points which feel a shock at 

 the same moment), 103. 

 Crater lake, 142. 

 Cretaceous period, 348. 

 period, animals of, 352. 

 period, areas of rocks of, .348. 

 period, coal of, 351. 

 period, physical geography of, 



348. 



period, plants of, 351. 

 Crinoid (lilylike stone), 277. 



range in time, 278. 

 Crust of the earth, 174. 



general configuration of, 176. 

 Cyathophylloid (cup-leaf like), 



275. 



Cycads : plants of cycas, or sago- 

 palm family, 329. 

 Cystid (baglike), 279. 



Darwin's subsidence theory of 



atolls, 104. 

 Deltas, how formed, 33. 



age of, 36. 



subsidence of, 169. 

 Dendrerpeton (tree-reptile), 320. 

 Denudation, or general erosion, 

 252. 



modes of determining amount 



of, 253. 

 Deposits, chemical, 72, 182. 



deep-sea, 117. 



made by waves, 50. 



mechanical, 182. 



organic, 182. 

 Devonian age, 286. 



age, animals of, 288. 



age, fishes of, 291. 



age, life-system of, 287. 



age, physical geography of, 287. 



age, plants of, 286. 



Devonian age, rocks of, 286. 



Devonian fishes, sudden appear- 

 ance of, 297. 



Diatoms (diarojiioS, cut in two) : 

 microscopic plants which 

 multiply by dividing in two, 

 115, 352. 

 shell deposits of, 116. 



Diabase, 212, 213. 



Dicotyls, contraction for dicoty- 

 ledons : plants having two 

 seed-leaves, 351. 



Dicynodon (two canine-toothed), 

 327. 



Dikes, 141, 216. 

 effect on stratified rocks, 217. 



Dinichthys (huge fish), 293. 



Dinoceras (huge horned animal), 

 377. 



Dinosaur (huge lizard), 334. 



Dinotherium (huge beast), 381. 



Diorite, 217. 



Dip and strike defined, 187. 



Diplacanthus (double spine), 293. 



Diplocynodon (double canine- 

 teeth), 347. 



Diprotodon (two front teeth), 402. 



Disintegration, rate of, 13. 



Dolerite, 214. 



Drift, 386. 



Drift-timber, 88. 



Dromatherium (running beast), 

 345. 



Dynamical geology, 9. 



Earth, crust of, 174. 



crust, cause of inequalities in, 



178-240. 

 crust, cause of movement of, 



171. 

 crust, gradual oscillation of, 



164. 



density of, 174. 

 general form of, 173. 

 general structure of, 173. 

 general structure of, means of 



observing, 175. 

 internal heat of, 131. 

 Earthquake, epicentrum of, 156. 

 focus, mode of determining, 



163. 



wave, nature of, 158. 

 wave, velocity of, 156. 



