353 
and Freshwater Deposits of Eastern Norfolk, 
posit is unseen, but is probably not much below the level of 
the sea, as Mr. Simons of Cromer tells me that he has seen 
chalk in situ at Mundesley at low water. In 1829 I ob- 
served a mass of the till prolonged in such a way into the 
freshwater formation at the southern junction of the latter 
with the drift as to imply the contemporaneous origin of the 
lower part at least of both formations. (See diagram, fig. 2.) 
Fig. 2. 
gravel, 
freshwater. 
till. 
freshwater. 
Interstratification of drift and freshwater at Mundesley. 
Yet 1 inclined then to the conclusion that the Mundesley 
formation, which I traced for nearly 300 yards along the 
coast, might, as a whole, be considered as the deposit of a 
lake or hollow excavated in the drift. In 1839, when a new 
section had been laid open by the sea, it appeared to me 
rather that these strata of Mundesley were simply a large 
development of those observable at the base of the cliff at 
Hasborough and other places, and that their position rela- 
tively to the drift might be represented by the diagram, fig. 3. 
Fig. 3. 
Mundesley. 
freshwater. 
Position of the freshwater beds at Mundesley. 
We may imagine that while the coast was sinking gradually, 
a small river may have entered here bringing down drift 
wood, freshwater shells, mud, and sand, and the flow of the 
stream may have partially counteracted those causes by the 
influence of which the boulder formation was accumulating 
in the spaces immediately contiguous. The following is a list 
of the shells which I obtained from the Mundesley beds, in- 
cluding some which Mr. Fitch of Norwich, and others which 
Mr. J. B. Wigham have kindly communicated to me : 1 . Pa- 
ludina impura\ 2. P. minuta, Strickland, (see fig. 4) ; 3. Val~ 
vata cristata \ 4. V . piscinalis \ 5. Limnca glutinosa\ 6. L. 
peregra; 7. Planorbis albus, var. (less flat, and aperture less 
