402 lamplugii : larger boulders of flamborough head. 
Cayton. 
The next place at which I have counted the boulders is 
ill Cjiyton Bay, four miles further north, where the drifts lie 
thickly in an ancient valley. The blocks examined were scattered 
over the face of the cliff, and had been chiefly derived from the lower 
clay. 
Table 9. — 100 boulders in the cliff in cayton bay. 
Per cent. 
1 4 Carboniferous Limestone. 
25 Sandstone and Grit, probably mostly Carboniferous. 
16 Jurassic Sandstone. 
18 Liassic Limestone and Shale. 
6 Oolitic Limestone. 
18 Basaltic rocks. 
3 Metamorphic rocks. 
100 
In this instance although the drifts rest on Middle Oohtes 
(Oxford Clay and Kelloway Rock) yet the Secondary Limestones 
have been mainly derived from the Lias ; and the list differs in this 
respect from that of Filey Brigg, though otherwise they present the 
same general features. 
Among the hundred blocks examined it chanced that there was 
no granite, but granite is by no means absent, and would certainly 
have shown itself in a longer list. 
Robin Hood's Bay. 
My next station for examining the boulders was in Robin Hood's 
Bay. One hundred blocks were counted in the high cliffs of drift 
near the town, and a second hundred were afterwards examined on 
the beach, but though these latter yielded confirmatory results, there 
was so much uncertainty in distinguishing between true erratics and 
boulders of rock detached from the neighbouring cliffs that I have 
not considered it advisable to include them in the lists. These 
boulders were chiefly in the lower clay. 
