Elements of geology / by Charles Lyell.

  • Charles Lyell
Date:
1838
Catalogue details

Licence: Public Domain Mark

Credit: Elements of geology / by Charles Lyell. Source: Wellcome Collection.

    570/582 page 540
    O. Obsidian, 164. Oeynhausen, M., on granite veins, 210. —, on isle of Arran, 510. Old Red sandstone, its subdivisions and fossils, 452. , trap rocks of, 483. —, plutonic rocks of the, 500. Olivine, 167. Oolite formation, name whence de- rived, 29. 368. , extent and subdivisions of, 368.' , fossils, 370 to 384. —, changes in organic life during its accumulation, 375. —signs of land during, 380. —, volcanic rocks of the, 481. —, plutonic rocks of the, 497. , metamorphic, in Apennines and Alps, 514, 515. and Lias, origin of the, 399. , valleys and escarpments formed by, 403. Ophiolites, 164. 478. 481. Ophites, 164. 480. Oppenheim limestone, 58. Orbicula reflexa, 379. Orford, crag strata near, 302. Organic remains, age of strata proved b/, 274. 471. —. See Fossils. Orthoceras, figures of, 437. Orthocerata, on structure of, 462.; Ostrea, 61. 316, 317. 376. 379. Outcrop of strata explained, 111. Overlying, term applied to volcanic rocks, 17. 215. Owen, Mr., on fossil bone from En- stone, 384. Oxford clay, 400. 402. 404. P. Palceoniscus, 416. Palaeontology, term explained, 281. Palaeotherium, 311. Paludina, 62. Pampas have been raised slowly, 96. Parasitic fossils, 46. Pareto, M., on altered Oolite, 514. Passy, M., on chalk cliffs of Normandy, 336. Patagonia, plains of, upheaved gra- dually, 96. Pearlstone, 164. Pebbles in chalk, 322. Pecopteris lonchitica, 428. Pecten, figures of, 331. 425. Pegmatite described, 202. Peperino described, 159. Pepys, Mr., cited, 85. Petrifaction of fossils, 79. Petrosilex, 164. Peyrehorade, nummulite limestone of, 341. Phasianella and cast of same, 80. Phillips, Prof., on grooved surfaces of faults, 121. , on joints in rocks, 237. , on the Coal strata, 420. 422. 425. , on the Mountain limestone, 437. , on Cambrian fossils, 465. Phillips, W., on composition of clays, 27. , on faults, 121. Pholadomya fidicula, 379. Phonolite, 164. Phyllade, 225. Physa, figures of, 62. Piddington, Mr., his analysis of the water in the mud of the Hoogly river, 86. Pingel, Dr., on subsidence in Green- land, 96. Pitchstone, 164. Plagiostoma, figures of, 316. Planorbis euomphalus, 62. Plants, fossil, of the Coal, 426. Plas-Newydd, changes caused by a dike near, 175. Playfair, on rise of land in Sweden, 95. , his description of faults, 117. , on Huttonian theory. 261. ! Plesiosaurus, 391. Pliocene, term, whence derived, 285. , period, newer, strata of, near Naples, 293. , in Norway, 295. , in S. America, 295. , in W. Indies, 296. , in valley of Rhine, 297. , in Great Britain and Ireland, 298. , {older) in England, 299. , volcanic rocks of, 476. , plutonic rocks of, why invisible, 490. Plutonic action 246. 250. Plutonic rocks, described, 14. 195. , their relation to the volcanic, 15. , name whence derived, 16. , age of, how determined, 487. , Recent and Pliocene, why in- visible, 490. , of different periods, 490. , relative age and position of, 492,
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