STATIIER : NOTES ON THE DRIFTS OF THE HUMBER GAP. 
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clay of earthy texture, with bhiish or ash-coloured joint-planes. In 
a clean uuweathered surface the redness is seen to be uniform 
throughout the deposit, and a sharp and definite line of separation 
from the underlying clay (7) can generally be traced. The boulders 
in this clay are smaller and fewer in number than in the Lower Clay 
(7), and at Red Cliff, chalk pebbles seem to predominate, but the 
usual far-travelled types are also present, generally deeply weathered, 
and sometimes scratched. Referring to the diagram (A), it will be 
seen that this bed, near the middle of the section comes to a some- 
what abrupt termination, its place in the cliff being taken by the 
High Level Warp Series (fig. 4). There is no sign here of the one 
bed passing into the other, the junction is perfectly clean and sharp, 
and is probably due to erosion. 
4. High Level Warp and Sandy Series. — This series attains 
a considerable development in the Red Cliff section (figs. 5 and 6). 
It is a well-bedded deposit of sandy warp, passing now and again 
into almost pure sand, a fact which a colony of sand martins are not 
slow to recognise. Its position with regard to other beds in the 
section is somewhat peculiar. Eastwards it rests on the laminated 
clay (6), with which it is mingled to produce the intermediate bed 
described below (figs. 5 and 6). In other places it rests on the 
Lower Clay (7), excepting at its extreme western extension (fig. 4), 
where it overlaps the Upper Clay, and finally thins out (fig. 4). 
4a. Intermediate Bed. — This peculiar bed comes between the 
Laminated Clay and the High Level Warps. It persists for a long 
distance in the Red Cliff section, attaining a thickness of three or 
four feet in places (figs. 5 and 6). It is apparently made up of rolled 
fragments of the one bed embedded in a matrix of the other ; and in 
section has a very characteristic appearance, caused by the inclusions 
falling away and leaving the matrix in relief, in the form of cups and 
hollows (fig. 13). 
3. Flood Gravel.— Capping the highest part of Red Cliff, and 
resting on the Warp and Sandy Series, is an irregular gravel, chiefly 
chalk, but also containing rounded pebbles of grit, granite, rhomb 
porphyry, etc. (fig 5). 
