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.

    571/582 page 541
    Plutonic rocks. See also Hypogene rocks. Poikilitic group, 407. Polished surfaces of fissures and faults, 116. 121. Ponza islands, globiform pitchstone in, 187. Porcelain clay, 27. Porphyritic granite, 199. Porphyry described, 155. 164. Portland dirt-bed, 353, 355. Posidonomyu minuta, 410. Pozzolana, composition of, 75. Predazzo, Oolite altered at, 499. Pressure, consolidating effects of, 78. Preston, tertiary strata at, 298. Prestwich, Mr., on the Coal strata, 424. Primary fossiliferous strata, 455. , horizontal in Sweden, 463. Primary limestone, 224. Primitive or Primary, term, why er- roneous, 21. 23. 262. 268. Producta, figures of, 416. 437. Protogine described, 201. 222. 226. Puddingstone described, 27. , of Hertfordshire, 73. , of Messenia, 342. Pumice described, 157. 164. Pupa muscorum, 64. Purbeck beds, 345. Puzzuoli, elevated marine strata at, 293. Pyrenees, bent strata in, 112. 115. , lamination of clay-slate in, 229. ——, rocks altered by granite in, 245.496. , chalk of, 337. 341. , trap rocks of, 479. Pyroxenic-porphyry, 164. Q. Quadersandstein, 387. Quadrumana, fossil, 311. Qu&qua-versal dip explained, 111. Quartz rock or Quartzite described, 223. Quartz veins, 214. Quinquina, island of, rocks shivered by earthquakes in, 130. Quorra, R., delta of, 361. R. Radnorshire, trap rocks of, 485. Ramsholt, section at, 302. Rancie, altered Lias at, 245. Rathlin, dikes at, 177. Recent period, how separable from tertiary, 292. Recent period, formations of, in differ- ent countries, 293. 297. , volcanic rocks of, 476. , plutonic rocks of, why invisible, 490. Red sandstone and marl, origin of, 418, , of different ages, 419. See also Old, and New Red sand- stone. Reptile, living marine, of the Galapagos, 393. Reptiles, fossil, of the Wealden, 349. 363. , of the Lias, 390. , of the Muschelkalk, 411. of the Magnesian limestone, 417. ! Rhine, R., land shells drifted by, 59. ——, valley of, tertiary strata in, 297. Ribboned jasper, 244. Riley, Dr., on fossil reptiles, 417. Ripple mark, how formed (see Fig.), 40. Rock, term defined, 4. Rocks, all divisible into four contem- poraneous classes, 4. 19. , aqueous, described, 5. 25. , volcanic, described, 11. 141. , plutonic, described, 195. , metatnorphic, described, 219. , how to detect alumine or lime in, 28, 29. , hardened by exposure to air, 74. , their particles re-arranged by chemical action, 77. , transported by ice, 136. , how to be studied, 152. , altered by dikes and granite, 170. 175. 204. 242. 245.495. 511. , different ages of the four great classes of, 256. 271. 467. 487. 511. , classification of, 4. 24. 268. 279. Rose, G., on hornblende and augite, 149. , on composition of volcanic rocks, 161, 162, 163. Ross-shire, denundation in, 126. Rostellariajnacroptera, 310. Rother, R., buried ship in old channel of, 298. Rothliegendes, 415. Roththal, section in the, 519. Rouen, chalk needles near, 335. Rubble explained, 130. S. St. Abb’s Head, curved strata near, 101. St. Etienne, vertical trees in Coal strata at, 445. St. Helena, basaltic dike in, 183. Salbands, 173.
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