224 ADDITIONAL GEOLOGICAL NOTES
The accuracy of these observations was checked by Mr. Horace B
Woodward, and other indications observed conjointly proved that the genera)
loss at Covehithe amounted to about 50 yards since the present Ordnance map
was constructed. The lines of high and low water mark had manifestly
altered, so that a fresh survey was necessary.
A discussion on Coast Erosion took place at the Conference
of Delegates of the Corresponding Societies during the Bristol
meeting of the British Association in 1898. The labours of the
Coast Erosion Committee were then at an end. A chief result
of this discussion was an application to the Admiralty, which has
since secured the co-operation of the Coast Guard in noting the
changes on our coast. One speaker, Mr. W. H. Wheeler, who
had paid much attention to the subject, then remarked that the
retention of a considerable mass of shingle in front of a place
would furnish a better protection than a sea-wall. As to the
cause of the travelling of shingle along the shore in a definite
direction, Mr. Wheeler, in a paper read to Section C. at the
same meeting, said "that the travel of shingle is not coincident
either with the prevailing or predominant winds, but on a
tidal coast the predominant drift is invariably in the same
direction as that of the flood tide." (Report 1898 p. 884.)
North of the estuary of the Thames the shingle travels from the
north southward; south of the estuary it travels from the south
northward.
It should be added that the Reports above alluded to contain
a Bibliography of the subject up to the year 1895.
ADDITIONAL NOTES ON THE SECTIONS
SHOWN AT THE NEW RESERVOIRS IN
THE VALLEY OF THE LEA, NEAR WAL-
THAMSTOW.
EVIDENCE OF THE PUDDLE-TRENCHES.
By T. V. HOLMES, F.G.S., F. Anthrop. Inst., Vice-President E.F.C.
While the sections afforded by the excavations for the new
reservoirs have been of the highest interest in their display of the
various changes in the details of the river deposits, they have