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INDEX.
357
with respect to surface of the earth, 36. Fissures in, 303. Particles of, re-arranged by action of igneous rocks, ii. 126. Alteration of chemical nature of, produced by igneous action, 131. Argillaceous slaty, altered by the proximity of granite, 142.
Rocks, igneous, prevalence of, beneath gneiss and mica schist, i. 121. In Palaeozoic strata, 134. In Silurian system, 148. In Carboniferous system, 184. In Triassic system, 208. In Oolitic system, 231. In Cretaceous system, 243. Origin of unstratified, ii. 71. See Rocks, Unstratified. Gradations among, 87. Chemical composition of, 90. Analysis of minerals found in, 91-95. Exterior forms of the masses of, 95. Interposed beds of, 95. Overlying masses of, 97. Fissures in, 97. Dykes in, 98. Veins in, 99. Amorphous masses tinder all the strata of, 108. Internal divisions of, 108. Phenomena of, when in contact with stratified masses, 109. Alteration of the structure of, by heat, 111. Metamorphism of rocks, a phenomenon of, 125. Re-arrangement of particles of limestone rocks, a phenomenon of, 126. Alteration of the chemical nature of rocks a result of the action of, 131. New minerals formed by the action of, 136. Metamorphic slates, another result of, 139. Metamorphism of mica schist and gneiss caused by action of, 143. Antiquity of, 145. Tables of principal disturbances of stratification in connection with, 152.
Rocks, metamorphic, ii. 125.
Rocks, mixed, ii. 86.
Rocks, pyrogenous, antiquity of, ii 145.
Rocks, series of stratified, i. 9. 53. Lapse of time, how ascertained from their nature, 10. Their dip at various parts of England and the Continent, 37. Local declinations of, 39. Relation of faults to disturbed, 44. Origin of stratified and unstratified,45. Varieties of stratified,59. Secondary of Yorkshire, 66. Cleavage of stratified, 67. Historical view of stratified, in the earth's crust, 107. Phenomena attending igneous rocks when in contact with, ii. 109. Induration of, 109. Temperature of, 272. Displacements of, 289.
Rocks, unstratified, crystallisation of, ii. 47. General remarks on, 71. Their igneous origin, 71. Geological age of, 72. Composition of, 72. Mineral composition of, 80. Gradations among igneous, 87. Chemical composition of, 90. See Rocks, Igneous.
Rocks, volcanic, Scrope's synopsis of, ii. 83. Classification of, 84 87. See Volcanos.
Rodentia in marine deposits, i. 272. See Organic Remains.
Rogers, Professor, reference to his report on the succession of strata, i. 237. Tertiaries of N. America, how classed by, 264. 270. On extinct gigantic animals of North America, ii. 69. On earthquakes, 244, et seq.
Romans, woods of England destroyed by the, ii. 68.
Rose, Mr., researches of, on augite and hornblende, ii. 81.
Rosenmuller, M., his discovery of animal remains in caves of Germany, i. 312.
Rossberg Fall, ii. 20.
Rosse, Lord, his observations on Nebula, i. 32.
Rotheliegende, where found, i. 203.
Rowley Hills, basalt of. ii. 73. 109.
Rudberg, M., his experiments on heat, ii. 267.
Ruminantia in marine deposits, i. 273. See Organic Remains.
Russia, coal districts of, i. 183.
S
Sabine, Colonel, on the sea current of Maranon, i. 343.
Saddle, meaning of the word as used in geology, i. 39.
Saliferous system. See Permian and Triassic Systems.
Salisbury craigs, greenstone of, ii. 110.
Salt, origin of, i. 210. Rocks which enclose, 211. Cheshire district, 212.
Salt mines, of Northwich, i. 63. Their temperature, ii. 273. Of Bex, their temperature, 272.
Sand banks, origin accounted for, i. 341.
Sands of London, their composition, i. 16.
Sandstone, of Cumberland and Westmoreland, i. 16. Proportion of oxygen in, 25. Its analysis, 31. Table of deposits of new red, 55. Table of deposits of old red, 56.
