LAMPLUGH : GLACIAL SECTIONS NEAK BRIDLINGTON. 281 
trace clearl}' tlie northward extension of the Basement Clay over the 
fossiliferons Sevverby Clitf-beds, and thence over the solid chalk : a 
point which it will be my aim to elucidate still further in the sequel. i 
We thus find that the term " Basement Clay," first applied by i 
Messrs. Wood and Rome, apparently as a descriptive title, is not now ; 
used in exactly the same manner as by those authors, but is more | 
conveniently restricted to a dark earthy boulder-clay with shelly 
inclusions typically developed at Dimlington and Bridlington, but of 
whose extension in the interval between these two localities we have 
no evidence, though it may be supposed with probability to underlie 
this interval at a lower level than the base of the cliff. As thus defined ; 
it can no longer be described as a chalky clay, as it contains consider- 
ably less chalk than does the clay immediately overlying it in 
Southern Holderness, with which it has been confounded, and from ; 
which it appears to be quite distinct. This must be borne in mind 
in studying Messrs. Wood and Rome's or Mr. S. V. Wood's descrip- 
tions. It is not yet proved with what degree of accuracy we may call 
this clay the basement bed, since there is a considerable thickness of 
drifts below the sea-level in Holderness of which we know nothing ; 
but my recent researches have led me to think that though glacial | 
conditions may have prevailed long before the formation of this bed, | 
it was yet the earliest boulder-clay deposited in the area. This part ] 
of our subject will be discussed at length in the concluding " notes." | 
Description of the Clay. — We may now enter upon the study j 
of the Basement Clay, as developed in our section. It was here, as | 
usual, very heterogeneous in character, and consisted of a mixture, | 
more or less intimate, of greenish, earthy Boulder-clay, with pockets, 
streaks, and patches of sand, earthy gravel, or tough clay. Most of 
these inclusions were unfossiliferous, but a few contained marine i 
remains, and might therefore be considered as forming portions of I 
the " Bridlington Crag." These are marked oc. in the section, fig. 1. 
Though none of these fossiliferons j3atches attained the size of those 
which are occasionally exposed on the shore just beyond the southern i 
limits of our section (described by me in Quart. Journ. Geol. Soc, I 
xl., p. 314), they were yet large enough to contain a numerous fauna, 
which, however, did not reveal itself to the surface-collector, and ' 
I 
