DAKYNS : GLACIAL DEPOSITS. 
251 
the Wolds, from Bridlington to the chalk escarpment : over the 
very highest cliffs the topmost red weathering boulder clay seems 
often to be alone present. It often becomes so stony that it is 
hard to say whether it should be called gravel or boulder clay ; and 
quite in keeping with this we find that mounds of gravel, when traced 
to the cliff edge, seem to end in this earthy boulder clay ; thus the 
gravel mounds, stretching from Speeton along the top of the chalk 
escarpment, pass into boulder clay, as far as one can judge in the 
absence of perfectly clear sections. 
Phillips long ago remarked that the boulder clay north of 
Fiamborough, and even south of it too, was everywhere in two 
divisions ; and Messrs. S. V. Wood and Rome have divided the 
boulder clay of Ilolderness into three. The sections given above, 
shew however that in many places there are more divisions than 
two or three : for instance, at High Stacks there are seven divi- 
sions at least, four of which are boulder clay ; and at the south 
end of the Danes' Dike there are as many as thirteen divisons, 
five of which are boulder clay. 
The section at Danes' Dike further shows that the chalky 
gravel, which has been described as so frequently lying at the 
base of the glacial beds immediately upon the chalk, is by no means 
everywhere one and the same bed, for at the west end of the 
section, the chalky gravel H, rests immediately upon the chalk ; 
but eastward a lower boulder clay I, comes in below H, and still 
further east a lower chalky gravel J, comes in below I, resting on 
the chalk itself ; while in the centre of the old preglacial valley, a 
third bed M, composed of chalk debris, comes in between all the 
other glacial beds and the chalk itself. 
The character of the beds resting immediately upon the chalk, 
in several places, resembling as they do ordinary atmospheric det- 
ritus, supports the idea that the boulder clay was deposited upon 
a land surface; and the frequently disintegrated character of the 
chalk itself, noticed by Phillips, tells the same way. At the same 
