230 
THE AVON AND ITS GRAVELS 
of bu light brown sandy loam, with slightly subangular 
flints, some flint pebbles, many white quartz -pebbles, and 
an occasional pebble of sandstone and of a greenish quartz. 
It is covered by a brown earth with local Oolite debris. 
The whole is only a few (5-8) feet thick, and is preserved 
in a trough or hollow in the Oolite.” (A note indicates 
that the Rev. H. H. Win wood had also found a subangular 
fragment of Sansen stone and a pebble of black chert or 
hornstone.) 
There is obvious difficulty in correlating isolated patches 
at considerable distances, but Professor Prestwich’s con- 
tention is that the distinctive features of the accumulation 
which he calls the “ Westleton Shingle ” are of so marked 
a character and so different from those of the overlying 
glacial series where both occur together, that their origin 
must be different. He contended that the flint-pebbles of 
the Westleton Drift were derived from the shingle beds of 
Diestian (Bagshot and Lower Tertiary age), but whether 
from those in Belgium, the North of France, or Kent it 
is difficult to determine. 
2. The pebbles of white and rose-coloured quartz come 
apparently from the older rocks of the Ardennes, or in- 
