LAMPLUGH : GLACIAL BEDS. 
175 
Though in this section the Hessle and Brown Clays alone 
are divided by sand or gravel beds, still, if either of the 
other lines of division be followed for a short distance, thick 
sands make their appearance, and separate the clays most 
distinctly. 
Though Mr. S. V. Wood notices here the peculiarity in 
what he has termed the Upper part of the Purple Clay, he does 
not seem to think it was entitled to be considered as of 
separate age ; but it seems to me, that if divisions are made 
at all in the Yorkshire clays, this must be accepted as one. 
In conclusion, it will, perhaps, be of value to briefly 
recapitulate the evidence on which the divisions of the Drift 
in Filey Bay here proposed rest. 
To begin with the lowest bed : — the bottom Brown Band, 
with many stones, showed itself on the beach in very decided 
contrast with the overlying Blue Clay. But as this is at 
present the only notice of this bed, it would be premature to 
separate it. By doing so also, we should make the term 
" Basement," by which the next clay is known, in this case 
at least, a misnomer. Pending further evidence, it will 
therefore perhaps be better to class it provisionally with the 
Basement clay. 
Though in Filey Bay the Basement clay, which includes 
glacial shelly bands both at Bridlington, Dimlington, and 
here, is only separated from the overlying Boulder clay by 
an uneven surface, and strongly marked line, along which 
patches of clay free from stones occur at intervals, at Brid- 
lington this same line is marked by the presence of a very 
finely laminated, and in some places ripple-marked, clay 
which has filled up the inequalities of its denuded surface to 
a depth of 16 feet, just south of Bridlington, as was shown 
in the workings in connection with the sea-wall now being 
erected there. At Dimlington, also, the same line'is marked 
by thick sands and laminated clays. 
