On the Chalk of Buckinghamshire, fyc, 405 



with many flints. The higher division, or Margate Chalk, contains 

 but few scattered flint-nodules, and shows well-markedN.W. and S.E. 

 joints. The lower division, or Broadstairs Chalk, on the other 

 hand, is less jointed, and has many continuous layers of flint. The 

 beds form a very flat arch, as may be seen along the coast from 

 Kingsgate to Pegwell, between which places the flinty chalk rises 

 up from below that with few flints. 



It is remarkable that in this neighbourhood the Thanet beds are 

 conformable to the Chalk, the green- coated nodular flints at the 

 bottom of the former resting on a peculiar bed of tabular flint at the 

 top of the latter. 



3. " On the Chalk of Buckinghamshire, and on the Totternhoe 

 Stone." By W. Whitaker, Esq., B.A., F.G.S., &c. 



In carrying on the geological survey of Buckinghamshire, the 

 Totternhoe Stone (with its underlying chalky marl), which had been 

 sometimes thought to be the representative of the Upper Greensand, 

 was traced south-westwards into a part where that formation was 

 fairly developed, and was then found to overlie it. 



The divisions of the Chalk in Buckinghamshire are, in ascending 

 order, — 



(1) Chalk-marl, with stony layers here and there, and at top. 



(2) The Totternhoe Stone, generally two layers of rather brownish sandy 



chalk, hard, with dark grains of small brown nodules. 



(3) Marly white chalk, without flints. 



(4) Hard-bedded white chalk -without flints, forming generally a low ridge 



at the foot of the great escarpment. 

 (5)* The thick mass of white chalk without flints, or with a very few flints 

 in the uppermost part, and at top. 



(6) The "chalk-rock," already described in the Society's Journal, a thin 



hard bed or beds, with green-coated nodules. 



(7) The Chalk with flint, the lowermost part only coming on near the top 



of the escarpment, the rest bed by bed over the tableland southwards, 

 the angle of dip being rather more than that of the slope of the ground. 



4. "On the Chalk of the Isle of Wight." By W. Whitaker, 

 Esq., B.A., F.G.S., &c. 



The chief object of this paper was to show that here, as in Oxford- 

 shire, &c, the division between the chalk with flints and chalk 

 without flints is marked by a peculiar bed ("chalk-rock"), hard, of 

 a cream-colour, and with irregular-shaped green-coated nodules, 

 which may be seen in many of the pits on the southern flank of the 

 chalk-ridge, where, however, it is very thin. 



The author disagreed with the inference that the chalk was eroded 

 before the deposition of the Tertiary beds, which has been drawn 

 from the irregular junction of the two in the cliff- sections, and 

 thought that the irregularity had been caused rather by the forma- 

 tion of " pipes " after the deposition of the latter, although he did 

 not deny that there was other evidence of denudation of the Chalk 

 before the deposition of the Tertiaries upon it. 



