Notes on the Drift Deposits. 405 



acljacent counties, as far westward as Wiltshire, if not beyond. 

 This was succeeded at the end of the Westleton epoch by a 

 movement of elevation which raised that sea-bed from nearly its 

 then level on the east coast gradually to a height of 600 to 650 feet 

 in a north-westerly direction in Buckinghamshire, Oxfordshire, and 

 Berkshire. 



The physical and structural features by which I traced this bed 

 thus far cease on the north-western brow of the Chalk escarpment — 

 cease with the range of the Chalk and Tertiary strata on which it 

 rests. I have sought for it on the high grounds in the north of 

 these and other Midland counties, but without success. The 

 denudation which swept away the underlying Chalk and Tertiaries 

 has not left a trace of the Westleton Beds. 



It is, however, a curious circumstance that if we take the 

 Westleton Shingle in South Essex where it is [160 to 200] ^ feet 

 above the sea-level, and its outliers on the Chalk escarpment where 

 it is 650 feet high, and prolong this gradient to Derbyshire and 

 North Wales, it will be found to accord very nearly with the levels 

 of the fossiliferous gravel above Macclesfield and with the shelly 

 sands on Moel Tryfaen. 



[Comparisons were then to be made between the Marine MoUusca recorded from 

 the Westleton Beds, Quart. Journ. Geol. Soc, vol. xlvi, p. 116, and the species 

 obtained from Moel Trj-faen and Macclesfield, but the references were not completed.] 



[ rhe MS. of a portion of another paper was commenced by Prestwich, and five 

 pages of foolscap were written by him on Nov. 1st, 1895, the day when he was 

 seized with his last illness. The paper commences as follows : — ] 



On some Local Feesh-water Deposits underlying the Glacial 

 Series in the South of England. 



In succession to the Westleton Beds, and following on the 

 changes of level which then took place, are a few local deposits 

 which are important as indicating the nature and extent of those 

 changes. Overlaid, however, as they are generally by the Glacial 

 series they are rarely to be seen. In fact, the overlying Glacial series 

 has generally worn into and denuded these soft fresh-water beds so 

 that they are to be met with in very few places. They are sufficient, 

 however, to prove the fact. 



[Among these fresh- water beds the author would include the shell-marl underlying 

 the brickearth at Witham in Essex. See Wood «&; Harmer, Quart. Journ. Geol. 

 Soc, vol. xxsiii, p. 110 ; Prestwich, ibid., vol. xlvi, p. 135 ; and Whitaker, 

 " Geology N.W. Part of Essex," Geol. Survey, pp. 67-69. The deposit is usually 

 considered to be newer than the Boulder-clay of the locality. 



He also refers to the fresh-water deposit at Casewick in Lincolnshire, long ago 

 described by Professor Morris, and referred to by Professor Judd (" Geol. Rutland," 

 p. 244) as a "Pre-glacial? Lacustrine deposit." Mr. Clement Reid has recently 

 named a few plants, obtained by him from a lump of the Casewick clay, which 

 was given to him by Prestwich. Mr. Reid says : " There is nothing in the list to 

 throw any light on the age of the deposit, and so far as the flora shows it may be of 

 extremely recent date" (Quart. Journ. Geol. Soc, vol. liii, p. 463).] 



1 [Quart. Joiu-n. Geol. Soc, vol. xlvi, p. 135.] 



