INDEX. 



Geneva, lake of, advance of the delta of 



tho Rhone in/27 

 - change which will take place in the 



distribution of sediment when it is filled 



Genoa, height (if the tertiary strata above 

 the sea at, 165, 166 



- - position of the strata see diagram 



No. 28, 166 

 Geological periods, their distinctness may 



arise from our imperfect information, 56 

 Gergovia, hill of, alternation of volcanic 



tutl' and fresh-water marls in the, 238 

 . - section of, 259 



- intersected by a dike of basalt see 

 wood-cut, No. GO, '259 



GiaconiOj St., valley of, described, 84, 85, 



91 

 Gillenfeld. description of the Pulvermaar 



of, 197' 

 Girgenti, section at see diagram No. 5. 



64 



- - shells found in the limestone of, G5 



- dip of the tertiary strata at, 74 



- list of fossil shells from Appen- 

 dix II., p. 54 



Gironde, tertiary strata of the basin of the, 



206 

 Glaciers of Savoy, great quantities of rock 



brought down by the, 149 

 Glen Roy, parallel roads of, 131 

 Glen Tilt, junction of limestone and gra- 



nite in see wood-cut No. 88, 356 

 Gly, river, tertiary strata in the valley of 



the, 170 

 Gneiss, mineral composition of, 365, 367 



- passage of, into granite, 367, 372 

 -- was originally deposited from water, 



307 



- whence derived, 373 



Go/zo degli Martin, dikes intersecting 



limestone at, 69 

 view of the valley of see wood-cut 



No. 23, 110 

 Grammichcle, beds of incoherent yellow 



sand with shells found near, 66 



- - bones of the mammoth found in 



alluvium at, 1.51 



Grampians, granite veins of the, 357 

 Granada, tertiary strata of, 170 

 Granite, junction of limestone and, in Glen 



Tilt see wood-cut No. 88, 356 

 _ formed at different periods, 13, 357 



- passage from trap into, 361 



- origin of, 12, 363 



- pas.-age of gneiss into, 3G7, 372 



- - changes produced by its contact 



with strata of lias and oolite in the Alps, 

 371 



Griuiiie veins, their various forms and 

 mineral composition sec: wood-cuts, 

 N o s . 85, 86, 87, and 88, 353, 356, 370 



Graveseml, deep indentations in the chalk 

 filled with sand, gravel, &c., near, 282 



Greywacke, 377 



of the Eisel, 194 



age of the rocks termed, 327 



Greenough, Mr., on fossil shells from the 

 holders of the Red Sea, 136 



Grifone, Monte, caves containing the re- 

 mains of extinct animals in, 141 



Grit, calcareous, and peperino, sections of 

 sec diagrams Nos. 9 and 10, 72 



Grooved surface of rocks, how formed, 

 147 



Grosoeil, near Nice, tertiary strata found 

 at, 135 



fjuadaloupe, active volcanos in, 133 



Guidotti, Signor, on the shells of the gyp- 

 sum of Monte Cerio, 159 



Gypseous marls containing fish found at 

 Cas'.rogiovanni, 63, 67 



Gypsum, and marls, of the Paris basin, 247 



bones of quadrupeds, c., in, 251 



on the entire absence of marine re- 

 mains in the, 252 



of St. Remain on the Allier, 233 



beds of, interstratined with the sub- 



Apennine marls, 159 



unaltered shells in the, 159 



Gyrogonites, abundant in the fresh-water 



formations of the Paris basin, 250 



Hall, Sir James, his experiments on rocks, 

 124 



on the grooved summits of the Cor- 



storphine hills, 147 



Hall, Capt. 13., on the parallel roads of 

 Coquimbo, 131 



on vertical dikes of lava in Madeira, 



134 



on the veins traversing the Table 



Mountain, Cape of Good Hope, 354 



Hamilton, Sir VV., his account of the 

 tion of Vesuvius in 1779, 122 



Hampshire basin, tertiary formations of the 

 18, 280 



mammiferous remains of the, 280, 281 



on the former continuity of the Lon- 

 don and, 283 



Happisborough, diagonal stratification of 

 the crag strata near see wood-cut No. 

 32, 174 



Hartz mountains, geological and geogra- 

 phical axes of the, 346 



Hastings sands, their composition, 280 



anticlinal axis foimed by the, 287 



Haute Loire, fresh-water formation of the, 

 235 



Headen Hill, section of, 281 



Heat, its influence on the consolidation of 

 strata, 334 



Hebrides, age of the volcanic rocks of the, 

 336 



erup 



