550 A. R. Horwood—Post-Pleistocene of Central England. 
But he admitted this was only a provisional arrangement, and much 
subsequent subdivision has been made.’ 
He classed as pre-Glacial the following :— 
1. Pebbly gravels and sands. 
2. Brick-earths. 
3. River gravels. 
4. Lacustrine deposits. 
In referring to the deposits mentioned below as pre-Glacial at 
Casewick, Mr. Clement Reid indeed regards them as Neolithic, but 
they may be, he says, ‘‘of older date.” He records Vuphar luteum, 
Galium aparine, Atriplex patula, Rumeax crispus, in addition to those 
given below. But we only here need consider those deposits in which 
land or freshwater mollusca occur, so that these modifications do not 
affect the case, for it is rarely that any molluscan remains are found in 
the Boulder-clay itself in the Midland area,” whilst the few instances 
of marine shells in the pre-Interglacial or post-Glacial beds are 
mentioned only to indicate where lacustrine and marine conditions 
alternated. 
It is in the lacustrine deposits alone that plants and shells have 
been found in the above area. Thus Professor Morris* discovered 
a freshwater deposit at Casewick in a hollow of the Kellaways rock 
covered in turn by glacial beds. The section was— 
ft. in, 
1. Gravel and sand in wavy seams. 2 ; eS 
2. Sand and gravel, with Belemnites, Gryphea, etc. 3 0 
3. Freshwater deposit, grey, sandy clay . : , 2 0 
4. Freshwater deposit, brown, sandy clay and veins of 
gravel . : - : ¢ . : : 6 
5. Freshwater deposit, peaty clay with plants and shells 176 
6. Freshwater deposit, dark sandy clay with plants and 
shells, with pebbles of chalk and flint and fragments 
of northern clay drift, the base being extremely 
irregular . : : 3 ; . . : 30 
18-19 0 
The plants, Crustacea, etc., were as follows :— 
PLANTA. Planorbis carinatus. 
Ceratophyllum demersum. Lf 2 umbilicatus. 
Equisetum. Limnea peregra. 
C Ancylus fluviatilis. 
BUSAN ACE Nc ‘ Velletia lacustris. 
Candona ? lucens (juv.). Bythinia tentaculata, 
C. reptans. ; Valvata piscinalis. 
Cypris (small species). V. cristata. 
GASTEROPODA. LAMELLIBRANCHIATA. 
Helix aculeata. 
HI. pulchella. 
H. hispida. 
Succinea putris. 
Carychium minimum. 
Spherium corneum. 
Pisidium amnicun. 
P. amnicum, var. puichella. 
P. pusillum. 
P. pusillum, var. obtusalis. 
1 R. M. Deeley, Quart. Journ. Geol. Soc., vol. xlii, p. 487, 1886. 
2 At Beasley’s Pit, Aylestone, Mr. G. W. Lamplugh and the late C. Fox 
Strangways found Zellina balthica. ay 
3 Quart. Journ. Geol. Soc., vol. ix, p. 321, fig. 2, 1853. 
