248 CROFTS : notes on Alexandra dock extension, hull. 
colour. Overlying these beds there is boulder clay of considerable 
thickness, stiff, grey in colour, and containing a large number of 
Chalk boulders. 
Next in the order of succession is the gravel, here 
reduced to 3 ft. 6 in. in thickness, very coarse at its base, with 
fine pebbles at the top, stained black in narrow bands. Over 
this gravel is 5 ft. of the red stoneless clay with passage beds 
of bedded sand between them. Along the middle of this clay 
there is a laminated band formed of extremely fine layers. The 
base of the red clay rises towards the north until it is entirely 
supplanted by the gravels. At its southern end the gravels 
intrude into it, splitting it into two beds before they supersede 
it altogether. 
In the south-western portion of the dock area, the laminated 
warp rested on the red clay with the shell bed only intervening ; 
further to the north, the clay is capped with gravel, apparently 
of glacial origin, with intrusions into the cla}-, as well as isolated 
lenticular patches. This gravel has patches of a waterworn 
gravel with peat fragments overlying it in places. The upper 
surface of the clay is in some places quite level, in others is 
undulated as if the agency of w^ater had assisted in moulding 
the surface. The clay is apparently quite free from boulders, 
is of an extremely fine nature, and was no doubt deposited 
contemporaneously with the gravels into which it is dovetailed. 
It very commonly forms the upper member of the glacial series 
in this locality, but I do not ever remember seeing it except 
under a peat bed, or where a peat bed has existed at some time, 
as if it was of such an impersistent nature as to be unable to 
stand sub-aerial denudation without the protection of a covering 
such as the peat bed. 
The upper boulder clay which underlies the red stoneless 
clay and gravel, although appearing in some places of a grey 
colour and very compact, generally follows the description of what 
is known as the Hessle clay, containing a large number of Chalk 
boulders, having ashy coloured joints. Where the red stoneless 
clay is non-existent the upper surface is of a somewhat gravelly 
