INDEX. 



ABBEVILLE flints and flint-formers, 284. 

 .fEpiornLs, extinction of, in Madagascar, 



Agassiz, " monograph of fossil fishes," 



Agents modifying the earth's crust, 38. 

 " Age of mammals," the, 207. 

 " Age of reptiles," the, 193. 

 Amber, its relation to lignitic beds, 



211. 



Ammonites of secondary systems, 193. 

 Animals and plants of the future, 316. 

 Animals, systematic classification of. 



124. 



Anthracites as distinguished from bitu- 

 minous coals, 153. 

 Antiquity of man, relative not absolute, 



284. 



Antiquity, relative, of rock-deposits, 85. 

 Aqueous agencies, their operations, 40. 

 Archteopteryx, or fossil bird of oolite, 



196. 

 Atmospheric agencies, their operations, 



38. 



Atmospheric denudation, effects of, 53. 

 Auk, great, probable extinction of , 271. 

 Avalanches, formation and varieties of, 



219. 

 Azoic rocks, definition of, 97. 



Barrier reef of New Holland, 265. 

 Basins, tertiary, illustrations of, 204. 

 Beaches, raised, or ancient sea-margins, 



260. 



Bergrap, the, of Norway, 217. 

 Bird-life of secondary periods, 195. 

 Bone-shoals and osseous breccias, 265. 

 Boue, his description of glaciers, 222. 

 Boulder clay or lower " till," 234. 

 Bovine period in European geology, 



286. 



Bovine stage of post-tertiary epoch, 286. 

 Brick-clays of the glacial period, 238. 

 Britain's mechanical supremacy, and 



her coal-fields, 177. 



Bronze, stone, and iron ages, relative 



antiquities of, 279. 



Brown-coals or lignites, nature of, 167. 

 Browne on ice-caverns, quoted, 223. 

 Burrh- stone of tertiary formations, 



211. 



Cainozoic formations, definition of, 26, 

 29. 



Calc-tufa and calc-sinter, 262. 



Cambrian system, its rocks and fossils, 

 91. 



Cannel or parrot coal, 154. 



Carboniferous or coal-period vegeta- 

 tion, 167. 



Carboniferous period, its probable phy- 

 sical conditions, 170. 



Carboniferous system, subdivisions of, 

 161. 



Carses of Scotland, their formation, 

 256. 



Cave-bear, extinction of, in Europe, 

 270. 



Cave-earths and cave-dwellers of Eu- 

 rope, 283. 



Cave-lion, extinction of, in Europe, 

 270. 



Cephalaspis, old red sandstone fish, 



Chalk or cretaceous system, its com- 

 position, 190. 



Chambered shells of secondary ages, 

 193. 



Chemical action, metamorphic effects 

 of, 71. 



Chemical agencies, their operations, 42. 



Chronological arrangement of rock-^ 

 formations, 29. 



Chronology of geology, relative nature 

 of, 273. 



Chronology of rock-formations, how 

 determined, 26. 



Classification of rock-formations, 29. <-"" 



Cleveland ironstone district, 199. 



Climate, periodical oscillations of, 215. 



