90 



PROE. I. M'KENNX hughes on the 



Low-level Boulder-clays and Sands (Quart. Journ. Geol. Soc. vol. xxx. 

 1874, p. 36). 



It does not appear that any one has detected in that area any 

 patches of the drift directly due to the northern land-ice from which 

 so much of the material of all later drifts has been derived. The 

 numerous records of glacial striae on the solid rock lead one to think 

 that there cannot have been much erosion since the ice, whether 

 land-ice or iceberg, passed over it (see Mellard Reade, Proc. Liverpool 

 Geol. Soc. 1872-73, p. 42 ; Morton, ib. 1876-77, p. 284). But as 

 none of the marine deposits referred to under this head can have 

 been laid down until after the recession of the northern ice, they 

 must belong to an age of less severe climatal conditions. On the 

 other hand, as the ice must have lingered on the high ground of 

 North Lancashire and Wales long after the sea had covered the 

 Cheshire and Lancashire plains, some of these Lancashire and Che- 

 shire drifts may well be nearer the glacial age than the drifts the 

 shells of which are recorded in columns I., II., III., and IV. 



See also : — 



Egerton. Proc. Geol. Soc. vol. ii. 1836, pp. 189, 415. 

 Binney. Mem. Lit. Phil. Soc. Manchester, vols, viii., x. (1852). 

 Morton. Proc. Geol. Soc. Liverpool, 1870-71, p. 91. 

 Paterson. Proc. "Warrington Lit. Phil. Soc. 

 Mackintosh. Quart. Journ. Geol. Soc. vol. xxviii. 1872, p. 388, 



with Note by Gwyn Jeffreys, p. 391, and note by Searles 



Wood, p. 392. 



Mellard Reade. Quart. Journ. Geol. Soc. vol. xxx. 1874, 

 pp. 27, 281, vol. xxxix. 1883, p. 83 ; Proc. Geol. Soc. Liver- 

 pool, 1874-75, p. 35. 

 Ffarington, quoted by Darbishire. Quart. Journ. Geol. Soc. 



vol. xxx. 1874, p. 38. 

 In column VI. will be found a list of the Macclesfield drift-shells. 

 I have not distinguished the older and newer beds of Mr. Darbishire. 

 (Manchester Lit. Phil. Soc. vol. iii. 1865, p. 56 ; Geol. Mag. vol. ii. 

 1865, pp. 41, 298.) The shells recorded as having been found by 

 Prestwich in 1862 were from the same drift in an adjoining pit. 

 See also : — 



Sainter. ' Rambles round Macclesfield.' 

 Mackintosh. Quart. Journ. Geol. Soc. vol. xxxvii. p. 363. 

 Plant. Geol. Soc. Manchester, Feb. 1865 ; Geol. Mag. vol. ii. 

 1865, p. 179. 



Mellard Reade. Mem. Lit. Phil. Soc. Manchester, 1864-65. 



In column VII. I have marked the shells of the Hessle Beds, that 

 is, practically, the shells collected by Professor Prestwich in the 

 gravels of Kelsea Hill. The list was revised by Gwyn Jeffreys, and 

 published in Prestwich's paper on the Kelsea Hill Beds (Quart. 

 Journ. Geol. Soc. vol. xvii. 1861, p. 448). See also Clement Reid, 

 Mem. Geol. Survey, " Geology of Holderness " (see below, p. 93). 



These beds, according to Searles Wood, are postglacial, and are 

 identified with beds which rest on Boulder-clay, and with others 

 which are overlain by still more recent Lacustrine deposits with 

 Anodonta, Cyclas, Paludina, &c. 



