598 



INDEX. 



Trap rocks, description of, in South Devon (see 



Igneous rocks), -tTO. 

 Trap, remarks on the effects produced by, relative to 



the protrusion of granite in the Cotentin, &c., 5. 

 notice of, exposed in the railway cutting near 



Bleadon, 561. 

 Travertine, description of beds of, deposited by 



thermal springs in Asia Minor, 20. 

 Trees, fossil, description of, found at Dixon-fold, 



near Manchester, 173. 

 reasons for supposing they grew where 



found, 176, 177. 



additional observations, 177. 



arguments for supposing they were 



originally solid-wooded trees, drawn from the 



rapid decay of trunks of trees in the Tropics, 



179. 

 Trevelyan, W. C. Esq., notice by, of veins of gravel 



traversing granite in Guernsey, 567. 

 Trilobites, remarks on the distribution of, in Palaeo- 

 zoic rocks, 330. 

 remarks respecting species of, found in the 



Rhenish provinces, &c., 336. 

 Troad, notice of the tertiary massive deposits of 



the, 14. 

 Trochus, distribution of species in Palaeozoic rocks, 



324. 

 remarks on a carboniferous species of, 



found at Paffrath, 359. 

 Trogonau, notices of fossils characteristic of the 



mountain limestone from near, 298. 

 Tropics, remarks on the rapid decay of the interior 



of solid-wooded trees in the, 177. 

 Tubicolae, remarks on the genera of, in Palaeozoic 



rocks, 314. 

 Tufaceous deposits, notices of, formed by thermal 



springs in Asia Minor, 20. 

 Turbo, description of a new species from Limburg, 



358. 



U. 



Under-clay, description of the, of the South Wales 



coal-field, 491. 

 notice of the occurrence of, in America 



and Nova Scotia, 494, 495 note. 

 Unstratified deposits, Mr. Darwin on the, of South 



America, 415. 



Unstratified deposits, observations on the characters 

 and origin of, in Tierra del Fuego and the coasts 

 of the Strait of Magellan, 417, 420. 



agreement 



of, with the till of Scotland, &c., 420. 



on the 



causes which may have prevented the existence 

 or preservation of marine remains in, 421. 



notice of the probable occur- 



rence of, in the island of Chiloe, 425. 

 on one of the 



Chonos islands, 426. 

 Upper Franconia, description of the stratified rocks 



extending from the Thuringerwald through, to the 



Fichtelgebirge, 296. 

 Upper sandstone and shale, description of, on the 



Yorkshire coast, 143. 

 notice of fossils found 



in the, 144, 150. 

 Upper tertiary sand, description of, near Lisbon, 



108. 

 range of, north of the Tagus, 



108. 



south ofthe Tagus, 109. 



account of its mineral contents, 



109. 



Valenciennes, M., notices of his description of the 

 Thylacotherium, 48 et seq. 



Valley of the Santa Cruz, description of the deposits 

 and physical features of the country of the, 416, 



description of an estuary- 

 like plain in the upper part of the, 417. 



remarks on the recent ma- 



rine origin of the deposits of the, 416. 

 Velbert, notice of beds of chert with casts of encri- 



nites resembling Derbyshire screw-stones, near, 



231. 

 Volcanic rocks, description of modern, in Western 



Asia Minor, 27. 

 ashes and scoriae, account of hills of, in the 



Catacecaumene, belonging to the second volcanic 



period, 29. 

 Volcano, account of the extinct, of Aden, 499. 

 Volcanos, account of the extinct craters of the Cata- 

 cecaumene, 31. 



