276 LAMPLUGH : GLACIAL SECTIONS NEAK BRIDLINGTON. 
Proceediugs for 1882," I particularized the cliff-sectiou lying to the 
southward of the harbour, also now in part concealed, and discussed 
at length the Purple Boulder-clay, and its zone of stratification with 
associated sand and gravel. In Part III., published in the Proceedings 
for 1883, 1 1 described the sections revealed during the drainage of 
the town, and, in my concluding notes, while to a certain extent 
summarizing the results of the previous papers, I sought chiefly to 
elucidate the beds lying above the Boulder-clays. These I supposed 
to be all of fresh-water origin, and, in speculating on the mode of 
their formation, I incidentally suggested a theory to account for the 
presence of deep valle3^s of erosion in the now-dry Chalk Wolds, 
which has since been greatly strengthened by fresh evidence. 
In the present communication I purpose to describe the interest- 
ing cliff section, exposed for a short time through the breaking away 
of the sea-wall protecting the " Beaconsfield Estate" at Bridlington 
Quay, which is now again hidden by a new and more substantial 
erection. This section is conterminous on the north with that shown 
in fig. 1 of Part L, the two uniting at the ravine known as " Sands 
Cut." In this instance the most striking feature of the section is the 
unusually fine development of the " Basement Clay," which I shall 
therefore make the centre-piece of the paper. 
The Section. — The length of the section is 235 yards, and its 
average height a little over 30 feet. Before the new wall was built 
the sea had removed nearly every trace of the old structure, and the 
cliff was everywhere fully exposed except for a few yards near its 
northern termination, where the higher portion was obscured by 
ruins of the Skating Rink. 
Glacial Boulder-clays and gravels made up the whole of the 
section except towards the northern end, where there was a thin 
alluvial wash (1 of fig. 1) at the surface. The Boulder-clay was split 
up into three well-marked divisions, corresponding to the " LTpper 
and Lower Purple" and Basement " Clays of my previous papers ; 
and in one or two places there was also a tendency for the top division to 
admit a sand-and-gravel-parting so as to separate off an upper portion, 
* Proc. Yorksh. GeoL and Polyt. Soc, N.S. viii., p. 27. 
t Ibid, vol. viii., p. 240. 
