INDEX. 



313 



Peyrehorade, riummulite limestone of, 

 198. 



Phasianella and east of same, 55. 

 Phillips, Prof, on grooved surfaces of 



faults, 78. 



. on joints in rocks, 141. 



, on the Coal strata, 243, 244. 246. 



on the Mountain limestone, 253. 



, on Cambrian fossils, 270. 



Phillips, W.,on composition of clays, 25. 



, on faults, 78. 



Pholadomya Jidicuta, 219. 



Phonolite, 101. 



Phyliade. 135. 



Physa, figures of, 45. 



Piddington, Mr., his analysis of the 



water in the mud of the Hoogly 



river, 58. 



Pingel, Dr., on subsidence in Green- 

 land, 63. 



Pitchstone, 101. 



Flagiostoma, figures of, 183. 



Planorbis euomphahis, 45. 



Plants, fossil, of the Coal, 247. 



Plas-Newydd, changes caused b)'^ a 

 dike near, 107. 



Playfair, on rise of land in Sweden, 63. 



, his description of faults, 76. 



, on Huttonian theory, 154. 



Plesiosaurus, 228. 



Pliocene, term, whence derived, 166. 



, period, newer, strata of, near Na- 

 ples, 170. 



, in Norway, 171. 



, in S. America, 171. 



, in W. Indies, 171. 



, in valley of Rhine, 172. 



, in Great Britain and Ireland, 172. 



, {older) in England, 173. 



, volcanic rocks of, 275. 



, plutonic rocks of, why invisible, 



283. 



Plutonic action, 145. 148. 



Plutonic rocks, described, 20. 118. 



, their relation to the volcanic, 20. 



, name whence derived, 20. 



, age of how determined, 281. 



— i — , Recent and Pliocene, why invisi- 

 ble, 283. 



, of different periods, 283. 



, relative age and position of. 284. 



. See also Hypogene rocks. 



Poikilitio group, 236. 



Polished surfiices of fissures and faults, 

 75. 78. 



Ponza islands, globiform pitchstone in, 

 113. 



Porcelain clay, 26. 

 Porphyritic granite, 121. 

 Porphyry described, 96. 101. 

 Portland dirt-bed, 205, 206. 

 Posnlonomya minuta, 238. 

 Pozzolana, composition of 53. 

 Predazzo, Oolite altered at, 288. 

 Pressure, consolidating effects of, 54. 

 Bb 



Preston, tertiary strata at, 173. 

 Prestwich, Mr., on the Coal strata, 245 

 Primary fossiliferous strata, 264. 



, horizontal in Sweden, 259. 



Primary limestone, 134. 

 Primitive or Primary, term, why erro- 

 neous, 23, 24. 154. 157. 

 Producia, figures of 241. 253. 

 Protogine described, 122. 133. 135. 

 Puddingstone described, 26. 



, of Hertfordshire, 52. 



, of Messenia, 199. 



Pumice described, 97. 101. 

 Pupa muscorum, 46. 

 Purbeck beds, 200. 



Puzzuoli, elevated marine strata at, 170. 

 Pyrenees, bent strata in, 72. 74. 



, lamination of clay-slate in, 137. 



, rocks altered by granite in, 145, 



286. 



, chalk of 195. 197. 



, trap rocks of 278. 



Pyroxenic-porphyry, 101. 



Quadersandstein, 225. 

 Quadrumana, fossil, 180. 

 Quaqua-versal dip explained, 72. 

 Quartz rock or Quartzite described, 133, 

 Quartz veins, 129. 



Quiriquina, island of rocks shivered by 



earthquakes in, 83. 

 Quorra, R., delta of 209. 



Radnorshire, trap rocks of 280. 



Ramsholt, section at, 175. 



Rancie, altered Lias at, 145. 



Rathlin, dikes at, 108. 



Recent period, how separable from ter- 

 tiary, 169. 



, formations of in different coun- 

 tries, 170. 172. 



, volcanic rocks of 275. 



, plutonic rocks of why invisible, 



283. 



Red sandstone and marl, origin of 242. 



, of different ages, 242. 



. See also Old, and New Red 



sandstone. 



Reptile, living marine, of the Galapa- 

 gos, 229. 



Reptiles, fossil, of the Wealden, 202. 

 210. 



, of the Lias, 227. 



, of the Muschelkalk, 238. 



, of the Magnesian Limestone, 242. 



Rhine, R., land shells drifted by, 43. 



, valley of tertiary strata in, 172. 



Ribboned jasper, 144. 

 Riley, Dr., on fossil reptiles, 242. 

 Ripple mark, how formed {see Fig.), 33. 

 Rock, term defined, 14. 

 Rocks, all divisible into four contempo- 

 raneous classes, 15. 22. 



, aqueous, described, 15. 25. 



, volcanic, described, 18, 89. 



