LAMPLUGH : GLACIAL BEDS. 
167 
ON THE DIVISIONS OF THE GLACIAL BEDS IN FILEY BAY. 
BY G. W. LAMPLUGH, F.G.S. 
Upon examination, the interesting, but hitherto neglected, 
drifts which fill the old preglacial hollow between Filey and 
Speeton are found to comprise in their sections a fuller series 
than is elsewhere to be seen in East Yorkshire, instead of 
all being included, as was supposed by Messrs. Wood and 
Home, in but one division of their glacial series, that to 
which they have given the name of " Purple Clay without 
Chalk." * 
So long ago as 1868, Professor Phillips, f in a short paper 
on the Hessle drift, pointed out that it was probable there 
were really two, or even three, boulder clays north of 
Flambro' ; and, in a more recent paper, Mr. S. V. Wood { 
remarks that he and his colleague, the Rev. J. L. Pome, sub- 
sequent to the publication of their joint paper, traced the 
Hessle clay to the borders of Durham, though this does not 
seem to refer to the coast section. 
So far from these drifts, then, being without division, 
we shall see that they may be clearly separated into even 
more than the three clays suggested by Professor Phillips, 
the divisions thus obtained being clearly the northern repre- 
sentatives of the clays seen in Holderness. 
It is not, indeed, strictly necessary to suppose that each 
of the dividing lines which can be traced in these drifts 
marks a long " interglacial period." Whether they do 
or not is a matter of theory; but they are worthy of 
attention, even if looked upon simply as forming good lines 
of division, in the same way that the adjacent Neocomian 
clays of Speeton have been divided into numerous well- 
marked zones. 
* Quart. Jour. Geol. Soc, Vol. xxiw, p. 147. f Ibid., Vol. xxiv., p. 250. 
t Geol. Mag., Jan. 1878, p. 17. 
