INDEX. 



513 



Thame, Oxfordshire, strata there, 279, 282. 

 Thermal springs of Konkun in the East Indies, 



427. 

 Thirria, M., on beds below the chalk in the De- 

 partment of the Haute Saone, 330. 

 Thomae, M. Carl, on the lava of the Roderberg, 



473 ; on the loess around the Roderberg, 475, 



476. 

 Tilburstow Hill, Surrey, list and sketch of beds 



composing the section, (wood-cut,) 138, 139. 

 Tisbury, Vale of Wardour, quarries at, 255. 

 Titaniferous iron ore, found in the Lower green - 



sand at Hunstanton, 313. 

 Tonbridge Wells, strata there resembling tliose of 



the coast near Hastings, 170, note. 

 Trachyte and basalt of the environs of Bonn, 



age of, 467. 

 and grauwacke, instance of a junction 



of, in the neighbourhood of Bonn, 440. 

 of the environs of Bonn, 437 ; its loca- 



lities and varieties, 437, 438. 

 Trachyte, its affinity with the trap family, 438. 

 Trachytic tuff, its correspondence in composition 



with adjacent trachyte nearest to it, 442. 

 ■ of the Siebengebirge, 440-443; 



its localities and characceristics, 441, 442. 

 , the oldest of the volcanic pro- 



ducts of the environs of Bonn, 467. 



Trap region, in the Peninsula of India, of amaz- 

 ing extent, 428. 



, extent not yet appreciated, 409. 



, authorities upon its stratification 



referred to, 410, note. 



its age uncertain, 430 ; probably 



not identical with that of the new red sandstone, 

 429. 

 rocks in the Ghats of the Dukhun, charac- 



ters of described, 422. 

 Tree, fossil, a remarkable specimen of, found in 



clay at Brill, 280. 

 Trees, coniferous, siiicified found at Portland, 13, 



221. 

 , ascertained by 



Dr. Prout to be almost wholly siliceous, 225. 

 in the lowest 



Purbeck strata of the Vale of Wardour, 256. 



Trees, coniferous, siiicified, wood-cut of a re- 

 markable specimen, 221. 

 Trigonelhtes of Parkinson (PI. XXIII. f. 2.), the 



name retained, why, 348. 

 found in the Kimmeridge clay in 



Cambridgeshire, 273; and near Aylesbury, 



Bucks, 292. 

 Troutbeck, account of fault in the valley of, 53. 

 Tucksbury Hill, (or Farnham Beacon,) near 



Farnham, Surrey, section through, 149. 

 Tuff of Siegburg, its great resemblance to that of 



the Phlegraean Fields and Ischia, 446. 

 Turner, Edward, M.D., Sec. G.S., analysis by, 



of the green matter of green-sands, 108, note. 

 'I'urna Fell coal works, section of beds at the, 93, 



note. 

 Twelve-fathom limestone, description of, 79 ; 



abounds with encrinital remains, 80. 



U. 



Upper millstone grit, description of, between Pe- 



nigent and Kirkby Stephen, 82. 

 Upware, on the river Cam, quarries there of the 



Oxford oolite, 307 ; fossils obtained there, 317. 



V. 



Vale of Bredy, geological formations of the, 32. 



Wardour, geological structure of, 244. 



Weymouth, physical features of the, 3. 



Valley, remarkably narrow, on the Mota river, 



south of Bonn, 412. 

 Valleys in the limestone band of the Cumbrian 



mountains, scooped out upon lines of fracture, 



52, 54. 

 in Dorsetshire produced by denudation, 



41. 



of the Dukhun in India described, 412. 



Vegetable remains of the environs of Bonn, ex- 

 amined by Professor Lindley, 451. 

 , absence of, in the loess of 



Bonn, 462. 

 Vegetables, fossil, of the Upper green-sand, 157, 



203. 



. Gault, 115. 



Lower green-sand, 131, 



153. 



