INDEX. 491 



Dangerfield, Capt., on various points of Indian " Dirt-bed ", silicified coniferous trunks found in, 



geology, referred to, 410, 414, 416, 418, 420, 13, 218, 220. 



424, 425, 426, 428. , Cycadeee found in, 14, 224. 



the great extent of the trap , notice of, in the Boulonnois, 15, note. 



formation in the Peninsula of India, 428. , a second and lower bed of, also con- 

 Davy, Dr., notice of a hot spring in Ceylon, 427. tains Cycadeae, 223. 



, on laterite in Ceylon, 430. '< Dirt, black," on the Dorsetshire coast, what, 



Deccan : see Dukhun. 287. 



De la Beche, H. T.. F.G.S., reference to his me- •' Dirt, black and grey," clays, so called in Bucks, 



moir on the green-sands of Devonshire, 234. 290. 

 on the coast of Nor- Dislocations in the coal-fields of Bristol Channel, 



mandy, 330. little resemblance of, to those in the North, 58. 



— on marine equivalents ^ disturbing 



of the Wealden, 329. action probably not contemporaneous with that 

 .. and Dr. Buckland, of the North, 58. 



on the vicinity of Weymouth, 1, 217. , Prof. Sedgwick on the, which have 



Dent, persistence of coal seams in the valley of, separated the Cumbrian Mountains from the 



101, note. neighbouring carboniferous chains, 47, 56. 



Denudation producing valleys, account of, in Dor- Diss, Norfolk, section quite through the chalk at, 



setshire, 41. 311. 



Deposits, siliceous, of the brown-coal formation Distribution, local, of the strata between the chalk 



near Bonn, 448. and the Oxford oolite, in the South-east of 



Depressions, geological, in the Weymouth district, England, 321. 



34. Disturbances of strata in Buckinghamshire, 285. 



Desnoyers, M., notice of memoir on beds below near Hazeley, Oxfordshire, 



the chalk in the North-west of France, 330. 286 : see " Gulls". 



Devakl Unci, hot wells so called in the Konkun, in Portland, 218. 



427. near Sevenoaks in Kent, 



Devonshire, beds below the chalk in, 233, &c. 134, 135. 



, subdivisions of the green-sand se- Disturbing forces, their effects, on the coast of 



ries not discernible in, 233. Dorsetshire, 32. 



Diluvium, deposits of.inthe vicinity of Weymouth, Dolphin Sty, notice of fault at, 90. 



44. Dorking, and Leith Hill, Surrey, tract between 



organic remains occurring described, 143. 



in the, 44. Dorsetshire, Mr. Webster on, referred to, 1, 206. 



Dinton, Bucks, quarries at, 285. coast, fossils of, 228. 



Dinton, Vale of Wardour, S. Wiltshire, 248. , enumeration of authors on the coast 



"Dirt-bed" near the bottom of the Purbeck of, 1. 



series, in the Isle of Portland described, 13, , geology of the coast of, 1, 206. 



220. , the subdivisions of the green-sand 



of the Isle of Portland affords a mea- strata seen in Hants, Sussex and Kent, not re- 

 sure of the duration of the Portland stone in cognisable in, 9. 

 the state of dry land, 16. , description of tertiary deposits of 



, notice of near Upway, 15. the coast of, 4. 



— ^— — Portisham, 15. , description of puddingstone in, re- 



■ Thame, 15. sembling that of Hertfordshire, 5. 



VOL. IV. SECOND SERIES. 3 S 



