INDEX. 
Vol. III. 
Aberdeenshire, passage from trap into 
granite in, 361 
Abesse, near Dax, section of inland cliff at, 
— see wood-cut No. 53, 210 
Acquapendente, alternations of volcanic 
tuffs with the Subapennine marls at, 
159 
Adanson on the age of the baobab tree, 99 
Addington hills, 279 
Aderno, opposite dip of the strata in two 
sections near, 78 
Adour, section of tertiary strata in the val- 
ley of the — see diag. No. 51, 207 
Adur, view of the transverse valley of the 
river — see wood-cut No. 73, 299 
Agassiz, M., on fossil fish of the brown 
coal formation, 200 
on the fossil fish of the Paris basin, 
253 
on the distinctness of the secon- 
dary and tertiary fossil fish, 327 
Age of volcanos, mode of computing the, 97 
Ages, relative, of rocks how determined, 35 
Aidat, Lake, how formed, 269 
Aix, in Provence, tertiary strata of, 276 
■ fossil insects abundant in the calca- 
reous marl of, 277 
Albenga, height of the tertiary strata above 
the sea at, 165, 166 
resemblance of the strata at, to 
the Subapennines, 167 
Allan, Mr. T., his discovery of the bones 
of mammalia in the fresh-water strata of 
the Isle of Wight, 281 
Allier, river, section of volcanic tuff and 
fresh-water limestone on the banks of 
the, 258 
Alluvium, passage of marine crag strata 
into, 181 
ancient, of the valley of the Rhine, 
200 
of the Weald valley, 295 
Alluviums formed in all ages, 145 
■ of the newer Pliocene period, 139, 
145, 151 
■ distinction between regular suba- 
queous strata and, 145 
marine, 145 
— — British, how formed, 147 
European, in great part tertiary, 150 
Alluviums, underlying lavas of Catalonia, 
188, 189, 190, 192 
of the Miocene era, localities of, 
217 
trachytic breccias alternating with, 
in Auvergne — see wood-cut No. 54, 217 
of Auvergne, extinct quadrupeds in, 
218 
of different ages covered by lava in 
Auvergne — see wood-cut No. 61, 266 
of the Eocene period, 317 
Alps, shells drifted into the Mediterranean 
from the, 48 
■ erratic blocks of the, 148 
Maritime, tertiary strata at the base 
of the, 164 
i secondary strata penetrated by gra- 
nite in the, 358 
strata of oolite altered in the, 371 
Altered strata in contact with granite, 370, 
371 
strata, enumeration of the proba- 
ble conversions of sedimentary strata 
into well-known metamorphic rocks, 373 
Alternations of strata with and without 
organic remains, how caused, 254 
Alum Bay, alternation of the London and 
plastioclay in, 278 
Amer, geological structure of the country 
near, 185 
Anapo, valley of the, 111 
Andernach, gorge of, 152 
loess and volcanic ejections 
alternating at, 153 
Andes, sudden rise of the, said to have 
caused the historical deluge, 148 
Angers, fossil shells found at — see tables 
Appendix I. 
Anglesea, changes caused by a volcanic 
dike in, 368 
Animals, their fossilization partial, 31 
remains of, in the successive ter- 
tiary periods, 59 
Anoplolherium found in the fresh-water 
formation of the Isle of Wight, 281, 317 
Anthracite, whence derived, 373 
Anticlinal axis of the Weald valley — see 
wood-cuts Nos. 63 and 64, 288 
Anticlinal and synclinal lines described-? 
see wood-cut No. 68, 293 
