484 



INDEX. 



Basalt of the Dukhun, extraordinary heaps of 

 loose masses of, described, 421. 



dykes in the Dukhun described, 418. 



in general transversely prismatic, 



418. 



, remarkable one at Hurreechun- 



durghur described, 418. 

 common in the Siebengebirge, 445. 



Basterot, M.De, on the vicinity of Folkstone, 106. 

 Baw Fell, notices of structure of, 88, 96. 

 to the Howgill Fells, account of section 



from, 9G. 

 Beaumont, M. Elie de, reference to his memoir on 



the boundaries of the Paris and London basins, 



530. 

 Beck, Dr., of Copenhagen, on a deposit in the 



Isle of Bornholm containing plants like those 



of the Wealden, 330. 

 Bedfordshire, beds below the chalk in, 269. 



, fossils of, 296, 316. 



Belemnites, enormous deposits of, in the lias in 



Dorsetshire, 31. 

 Bell, Thomas, Esq., F.G.S., observations by, on 



a new fossil species of Chelydra, 379, 

 Bembridge Down, Isle of Wight, section at, 187. 

 Ben How Quarry, notice of, 396. 

 fault by which it is 



traversed, 396. 

 Benett, Miss, Cycadeoidea procured by, from 



Tisbury, 15. 

 , notice of catalogue of Wiltshire 



fossils by, 255, 256, 257. 

 , specimens of gum or resin ob- 

 tained from the gault near Crockerton, 257. 

 Bere Head, Devon, section of the coast at, 234. 

 Berkhampstead, Vale of, its general altitude, 283. 

 Berkshire, beds below the chalk in, 269, 270, &c. 

 Berthier,M., analysis by, of green particles, 109, 



note. 

 Birds, bones of, found in the Hastings-sand at 



Tilgate, 180; distinguished from those of Pte- 



rodactyles, 382*. 

 Bishopstone, near Aylesbury, section at, 287. 

 Black glossy slate of Cumberland contains no 



organic remains, 48, 66 ; probable cause of 



their absence, 66. 



" Black land", Gault so called, in Surrey, 141. 



Black limestone group between Kirby Stephen 

 and Penigent described, 73. 



, distinguished by regu- 

 larity of stratification, 73. 



, organic remains found 



in, 73. 



73. 



yields a fine black marble, 

 , list of quarries 



where found, 73. 

 Blackdown Hills, Devonshire, description of, 235. 



, fissures from dislocation at,235. 



, sithestone pits, section of, 236. 



, sithestones, mode of preparing, 



237. 

 Blackdown-sands, list of fossils from, 239. 

 , fossils of, well preserved, why, 



238. 

 , principally converted into 



chalcedony, 239, note. 

 Blackgang Chine, Isle of Wight, section at, 



194. 

 Blackstone Edge, notice of great saddle of mill- 

 stone grit at, 60. 

 Boblaye, M., notice of his memoir on the beds 



below the chalk in the North-west of France, 



330. 

 Bonn, Leonard Horner, Esq., on the geology of 



the environs of, 433. 



, district little known to geologists, 434. 



, general structure of the environs of, 435. 



, grauwacke, 436. 



, trachyte, 437. 



, basalt, 443 ; volcanic eruptions, 446. 



, brown-coal formation, 447, 473. 



, loess, 447, 469, 474, 479. 



, mineral waters, 403. 



, relative ages of tlie sedimentary rocks of, 



464. 



to 



the volcanic, 467. 



other, 467. 



, table of heights, 471. 



, Appendix, 472. 



volcanic rocks to each 



