212 STATHER : NOTES ON THE DRIFTS OF THE HUMBBR GAP. 
(section B, fig. 10), is a thin ripple-marked sandstone. Tlie section 
near the Httle house is described by "Mr. Jukes-Browne, as follows: — 
Feet. 
"Boulder Clay ... ... ... ... 10 
lied-brown Clay and Light-coloured Sand, inter- 
laminated and resting on a layer of hard rippled 
Sandstone ... ... ... ... 1 
Coarse Gravel of large round stones, Grey Chalk and 
Red Chalk among them, seen for ... ... 1." 
The sandstone appears to be somewhat intermittent, but the 
coarse gravel is always present, and 1 noticed recently at this horizon, 
partly incorporated with the base of the sandstone, large rounded 
pebbles of granite, Mountain Limestone, whinstone, &c., showing that 
the deposit belongs to the glacial series. 
7. Lower Boulder Clay. — This is a hard tough boulder clay, 
of greyish purple colour, containing many erratics, and here and 
there a pocket of sand or crushed chalk. It is best seen on the 
northern side of the Humber, at the Red Cliff section (A), where it 
forms the beach and occupies the lower part of the cliff for two- 
thirds of its length (figs. 2, 3, 4 and 5). Under favourable conditions 
this clay is readily distinguishable by its colour and texture from the 
other members of the series ; and in both sections (A and Bj its 
upper surface is extremely uneven and hummocky. 
At South Ferriby, the Lower Clay occurs only at the base of the 
cliff between the jetty and the house (fig. 9), while further west 
where other glacial deposits can be seen to rest upon the Chalk, well 
above beach level, it cannot be traced (fig. 10). 
6. Laminated Clay. — A beautifully laminated dark-grey clay, 
of fine texture, ripple-marked in places and almost entirely free from 
pebbles, occurs in isolated patches, and appears to occupy hollows in 
the upper surface of the Lower Boulder Clay. It is best seen at the 
eastern end of the Red Cliff section, where it occurs both in the cliff 
and on the beach (figs. 5, 6 and 7). 
5. Upper Boulder Clay. — This deposit which is well repre- 
sented both at Red Cliff and South Ferriby, is a foxy-red boulder 
* Survey Memoir, North Lincolnshire, p. 150. 
