ON AN ANCIENT SEA-BEACH NEAR BRIDLINGTON QUAY. BY | 
recent paper,’ is that the Basement Clay was the first boulder-clay to be 
formed in the district, and that as the Sewerby Cliff-beds are distinctly 
older than this clay, they must have pre-dated any actual glaciation of 
the east coast. A systematic investigation is now being made into the 
details of the glacial beds of the whole of Flamborough Head which it 
is hoped may yield further evidence on this question. 
The erratic pebbles which were obtained from the Old Beach have 
been examined and counted, with the result shown in the following 
table :-— 
Pebbles in the Old Beach. 
Per Cent. 
Carbonaceous Shale; origin uncertain . ; about 10 
Sandstones; in most cases not determinable, but many are not 
Secondary rocks : 5 c 2 : : . . 25 
Quartzites 5 : ; . 5 - : “ : 2220 
Palzeozoic conglomerates : ; : : ; - : : Tee 
Vein-quartz pebbles . . ° ; 7 2 . : ie 
Basaltic rocks . ; s c : Be it 
Porphyritic felsites and other i igneous rocks 5 : . . ey fills: 
Granites . : ‘ A : : : . : . - fz 
Oolitic limestones . § é ; : ; F ot lat 
Black and yellow flint (not local) ; 4 P . : 3 eee 
100 
Most of these pebbles were well rounded; but a few-were subangular, 
as if they had not been long exposed to the pounding of the beach. If 
the above table be compared with the lists of boulders from the boulder- 
clays compiled by the writer at various places on the Yorkshire coast? 
some important differences will be observed. 
Perhaps the most striking of these differences is that in this table 
there are no pebbles from the Carboniferous Limestone, a rock which 
abounds everywhere in the overlying glacial series. The quartzites and 
igneous rocks, vaguely classed as ‘ porphyritic felsites,’ are also in much 
higher proportion here than in the boulder-clays. Taken as a whole, it 
may be said that these pebbles have travelled further than a similar 
collection taken at random from the Kast Yorkshire glacial-beds. 
We do not propose to proceed further with this investigation at 
present, as the difficulties of the excavation are such, owing to the great 
depth of the loose sand, that it would be necessary to undertake much 
costly and unprofitable labour to render the work free from danger. 
Meanwhile the steady encroachment of the sea is slowly preparing 
another slice of the deposits for easy exploration in the future. 
We are greatly indebted to the Lord of the Manor for his courteous 
— to carry out the excavation, and desire to record our thanks 
to him 
The collection of fossils has been deposited in the Museum of Practical 
Geology, 28 Jermyn Street, London. 
1 Proc. Yorksh. Geol. and Pol. Soc. vol. xi. pt. ii. (1889), p. 275. 
* See papers in Proc. Yorksh. Geol. and Pol. Soc. vol. ix. pt. iii. p. 339; vol. xi. 
pt. ii. p. 231; and also abstract elsewhere in this vol., Proceedings of Section C. 
