lamplugh: lakger boulders of flamborough head. 401 
Filey. 
The next catalogue to which I shall draw attention carries us to 
the other, the northern, side of Flambro', and here also the proportion 
of the Secondary rocks is far higher than on the headland, but as 
the following lists will show, the composition of these Secondaries is 
altogether different from what it is in Holderness. 
The list given below was compiled in the cliffs of boulder clay 
which overlie the Oolite near Filey Brigg. The boulders were chiefly 
in the lower boulder clay. 
Table 8. — 100 boulders in the cliff above filey brigg. 
Per cent. 
9 Carboniferous Limestone. 
15 Sandstone, probably Carboniferous. 
2 Magnesian Limestone. 
2 Clay-slate (Paleozoic). 
25 Sandstone, probably Jurassic. 
26 Oolitic and Liassic Limestone. 
19 Basaltic rocks. 
2 Granite. 
ICQ 
The Secondary Limestones of this list consisted chiefly of blocks 
of the hard Coralline Oolite which in this locality forms the bed-rock 
for the drifts. The blocks may have been torn from the edge of the 
ridge w^hen that extended, before the encroachment of the sea, for a 
few hundred yards further to the northward, and as the strata rise 
steadily in that direction the parent-rock was probably above the 
present level of the boulders. 
I found recently on the rocky floor beneath the drifts at this 
place a most interesting feature, which so far as I know is not to 
be seen elsewhere on the Yorkshire coast. The oolitic platform is 
for some distance beautifully scored and polished by glacial striations ; 
and from these markings we learn that the ice which scored 
the rock came from N. 20 E., in which direction there is now only the 
open sea. 
