INDEX. 
103 
Robert, M., on extinct quadrupeds of Cus- 
sac,219 
Rocca di Ferro, shells in the tuffs of, 79 
Rochester, indentations in the chalk filled 
with sand, &c, near, 282 
Rocks, distinction between sedimentary 
and volcanic, 10, 352 
primary, 10 
■ origin of the primary, 11, 363 
distinction between primary, second- 
ary and tertiary, 10 
■ persistency of mineral character, 
why apparently greatest in the older, 331 
older, why most consolidated, 334 
older, why most disturbed, 335 
secondary volcanic, of many different 
ages, 335 
relative age of, how determined, 35 
proofs of, by superposition, 35 
proofs by included fragments of older 
rocks, 36 
proofs of their contemporaneous ori- 
gin derived from mineral characters, 37 
proofs from organic remains, 39 
volcanic of the Val di Noto, 63, 67 
— — — grooved surface of, 147 
transportation of, by ice, 149 
identity of their mineral composition 
no proof of contemporaneous origin, 
1G1 
Roderberg, crater of the, described, 198 
Rome, travertins of, 138 
hills of, capped by calcareous tufa, 
138 
Ronca, fossil shells found at — see Table, 
Appendix I. 
Royat, ruins of Roman bridges and baths 
at, prove that no great changes have 
taken place since their erection, 269 
Rozet, M., on the loess of the valley of the 
Rhine, 151 
Runton, folding of the crag strata in the 
cliffs near — see wood-cut No. 38, 178 
St. Christopher's, alternations of coral and 
volcanic substances in, 133 
St. Eustatia, tertiary formations in, 133 
St. Hospice, tertiary strata in the penin- 
sula of, 135 
St. Lawrence, Gulf of, changes which 
would result in, on the filling up of the 
Canadian lakes, 28 
St. Madeleine, near Nice, shells abundant 
in the loamy strata of, 168 
St. Michael's Mount, Cornwall, 371 
St. Peter's Mount, Maestricht, fossils of, 
325 
St. Roraain, gypsum worked at, 233 
St. Vincents, active volcanos in, 133 
Salisbury Craig, altered strata in, 369 
San Ciro, cave of, breccia containing bone 
of extinct quadrupeds in, 141 
San Ciro, position of the cave of, — see 
diagram No. 27, 141 
San Feliu de Pallerols, deep ravine cut 
through lava near the town of, 189 
San Quirico, hills of, their composition, 
159 
Sand and conglomerate of the sub-Apen- 
niue strata described, 159 
Santa Croce, Cape of, limestone resting 
on lava at, 68 
Santa Madalena, section at the bridge of, 
186 
Santa Margarita, size of the volcanic crater 
of, 187 
Sardinian volcanos, their age uncertain, 
193 
rest on a tertiary formation, 193 
Sasso, Dr., on the tertiary strata of Genoa, 
166 
on the fossil shells of Albenga, 167 
Saucats, fresh-water limestone of, 207 
Savona, tertiary strata of — see wood-cut 
No. 55, 166, 222 
Sciacca, volcanic island of, 69, 71 
Scoresby, Capt., on the transportation of 
rocks by icebergs, 150 
Scotland, parallel grooves formed in the 
beds of torrents in, 147 
granite veins of — see wood-cuts 
Nos. 85 and 86, 354 
Scrope, Mr. G. P., on the volcanic district 
of Naples, 125 
on the extinct volcanos of the Rhine, 
197, 201 
on the hill of Gergovia, 258 
on Mont Dor, 261 
on the excavation of lava by the 
river Sioule, 265 
on alluviums under lava at differ- 
ent elevations in Auvergne, 267 
Sea-cliffs, successive elevations proved by 
— see wood-cut No. 24, 111 
manner in which the sea destroys 
successive ranges of, 111, 292 
distinct ranges of ancient, in the 
Morea, 113 
found elevated to great heights in 
Peru, 130 
Seaford, waste of the chalk cliffs at, 311 
Secondary rocks, 14 
of the Weald valley divisible^ into 
five groups, 286 
their rise and degradation gradual, 
308 
enumeration of the principal groups 
of, 324 
no species common to the tertiary 
and, 327 
circumstances under which they ori- 
ginated, 23, 329 
why more consolidated, 334 
why more disturbed, 335 
