258 
that ice no longer came so low, nor covered the whole coast. 
This would explain the solitary appearances of his remains 
recorded here and there ; but I fail to see the force of the 
reasoning upon which it is assumed that man and his associates 
once were there, and their remains have been all swept away 
by ice. 
Travelling now south the estuary of the Wash gives little 
information on this question. The whole surrounding country 
is so low that 20 ft. depression would leave but a few gravel- 
mounds here and there above the water, and the sea is kept back 
by silting up of channels and artificial banks. However, at 
March, a town in the Cambridge Fens, some twenty miles from 
the Wash, a gravel-bed* occurs full of sea-shells of recent tempe- 
rate facies. At Manea, immediately beyond, at the same level 
in sand and loam, the Corbicula fluminalis is abundant. This 
little shell, now found no nearer than the Nile, is characteristic 
of the older river-gravels, which were deposited we know after 
Glacial times, because the older gravels have more, the newer 
less, of their material derived from glacial drift.F I see no 
reason why in the March gravels there should not be remains 
of man washed out to sea from those that lived along the river 
banks or were lost along the coast. The wonder is we have not 
found marine deposits of this age with the remains of man. 
The beds, so far as I know them in Norfolk and in Suffolk, 
from which palaeolithic implements have been procured rest 
on Middle Glacial, a much older series ; but if marine beds 
derived from these and representing the deposits of the 
estuary or mouth of the large rivers along which man lived 
were exposed we might expect to find some traces of him, 
and it would be difficult to distinguish the newer from tlio 
older beds. But we have not in all this area evidence of 
extensive earth-movements in the existence of marine deposits 
far above the present sea level. 
The only marine quaternary beds in the Hertfordshire J 
district are, I believe, of much earlier date, and do not bear 
upon the question now before us. 
Coming now to the Thames basin, we have again but 
scanty evidence of upheaval. There is, however, some. In 
the extensive excavations for brickmaking near Sitting - 
bourne, it was clear that there were at least two divisions of 
* Seeley, Quart. Journ. Geol. Soc., vol. 1866, p. 473. 
f Seeley, Quart. Journ. Geol. Soc., vol. xxii., p. 479. Fisher, Carnb . Phil. 
Soc., 1879. 
J Quart. Journ. Geol. Soc., vol. xxiv., p. 283. 
