506 



INDEX. 



Pisolitic iron ore, in the Hastings sand, near Portland Sand, coextensive with the Portland 



Hastings, 166. 



ings, 333. 



-, probably not confined to Hast- 

 en the Continent, in deposits 

 supposed to be coeval with the Wealden, 329, 

 330. 



Plastic clay, description of, near Weymouth, 5. 



Farnham, 150. 



Pleurotomaria (Trochus), note upon, 153. 



Poland, marine deposits in, supposed to be coeval 

 with the Wealden, 329. 



Pool Beck Scar, fault at, not marked by a valley, 

 52. 



Poorundhur, glassy felspar found at, in amygda- 

 loid, 424. 



Pope, Rev. W. L., a new species of Sphenopteris 

 found by, in the Hastings sand, 181. 



Portland Ferry and Weymouth Harbour, com- 

 position of the cliffs between, 24. 



- formation, its interrupted deposition in 

 England, 19. 



Portland, Isle of, summary of publications on, 

 217, 



■ , "dirt-bed" of the, 13. 



, detailed section of 



upper beds in, 219. 



—— , fossil trunks of Co- 



niferae and Cycadeae in, 13, 225. 



, phenomena of, analogous to 



those produced by earthquakes at the mouth of 

 the Indus, 226. 

 , hypothesis. 



explaining them, 226. 

 , quarries of, ought to be fre- 



quently examined, 227. 

 , strata pervaded by fissures. 



proving disturbance, 218. 

 , strike of the strata well ascer- 



tained, 214, note. 

 Portland Sand, group of strata proposed to be so 



called, 20, 210. 



abounds in green particles, 210. 



a stage of transition, from the 



Kimmeridge clay to the Portland stone, 21, 



331. 



stone, throughout the coast of Dorset, 19. 

 , concretional nodules in, near 



Thame, (wood-cut,) ; 283 ; at Shotover, 273, 

 278 ; at Swindon, 273 ; in the Boulonnois, 

 273, 328. 

 designated by Mr. Conybeare, 



210. 



, importance of distinguishing it, 



331. 



, probable occurrence of, at Shot- 

 over Hill, near Oxford, 21. 



, notice of, at Whitchurch, 21. 



, notice of, at Swindon, 21. 



in the Boulonnois, 21. 



■— , thickness of, in the South-east 



of England estimated, 320. 



near Aylesbury, 291. 



at Brill, 280. 



at Long Crendon, 282. 



at Emmet's Hill, Isle of Purbeck, 



211. 



Buckinghamshire, 301. 



- at Muswell Hill, Bucks, 283. 



- in Oxfordshire and Bucks, 273. 



- in the Pays de Bray, 328. 



- in the Isle of Purbeck, 210. 



- at Swindon, 266, 267. 



- near Stewkley, 292. 



- near Thame, 282. 



- Vale of Wardour, 255. 

 -at Whitchurch, 291. 



-, fossils of, in Dorsetshire, 20, 231 . 



at Swindon, 269. 



in Oxfordshire and 



-^ in the Vale of War- 

 dour, 261. 



Portland stone, its thickness in the South-east of 

 England estimated, 320. 



, passing into sand, in contact with 



Lower green-sand, 265. 



near Aylesbury, 286. 



in the Lower Boulonnois, 328. 



at Great Hazeley in Oxfordshire, 



276. 



in Oxfordshire and Bucks, 272. 



