246 
DAEYNS: GLACIAL DEPOSITS* 
GLACIAL DEPOSITS NORTH OF BRIDLINGTON. BY J. R. DAKYNS. 
M.A., H.M. GEOLOGICAL SURVEY. 
IN my paper published in the " Society's Proceeding's " for 1879, 
[ mentioned that the Gravels immediately overlying the Purple 
Boulder Clay, North of Bridlington, have in some places masses 
of Boulder Clay included in their lower parts. The diagram, Fig. 
1 , shews this : it represents the top of the cliff from the wall and 
stile at the south edge of Sewerby Park, as far north as the point 
where the footpath leaves the cliff. The letters P. B.C. stand for 
Purple Boulder Clay, and R.B.C. for Red Boulder Clay. 
I take from my note book the following : " Opposite Sewerby 
the gravel is interbedded with, and jammed against boulder clay 
in several places. East of the first turnip field, as you go east- 
wards, the gravel dies out, and the boulder clay is covered by a 
silty clay ; but the gravel soon reappears under the silty clay, 
and continues (though thin) resting on boulder clay, against which 
it seems to be jammed near the east end of the grass field. Beyond 
this all is obscure. Boulder clay seems to be at the surface ; then 
we have a hollow, like the site of a pool or stream course, occupied 
by gravel, probably recent. Beyond this we have well-bedded 
gravel at the top of the cliff over boulder clay." This last men- 
tioned gravel is the thick bed of gravel of drift pebbles, which 
forms the top of the cliff at the Danes' Dike valley. 
Another note says that " In the first turnip field east of Sewer- 
by Hall, opposite the first round plantation the Sewerby gravel is 
overlaid by clean red clay, which is seen at intervals nearly as far 
as the east end of the field. This clay is in some places seen to be 
laminated. The section of the whole cliff hereabouts is as follows : 
Clean red clay, alluvial, 
on Gravel, the Sewerby Gravel, 
on Boulder Clay, part of the Purple Boulder Clay, 
on Sand, probably the same bed as that which divides the P.B.C. 
at Bridlington, 
on Boulder Clay, the lower part of the Purple Boulder Clay, 
on Chalky Gravel, not continuous, but very general, 
on Chalk." 
