148 
LAMPLUGH : THE FLAMBOROUGH DRAINAGE SECTIONS. 
and I have no hesitation in identifying it as an inland prolongation 
of that deposit. Its occurrence at this point is interesting- as show- 
ing the presence of the division to within a short distance of the edge 
of the drift-covered area, and beyond the range of the gravel mounds. 
The Basement Clay was seen for only a few yards and then lost 
through the rise in the bottom of the trenches, which from this point 
became rapidly shallower, both along the line of the main drain and 
in the above-mentioned branch. This branch, like all the other 
trenches leading eastward, terminated in earthy gravel with much 
water. The main, along North Sea Lane, was laid at an average 
depth of only 9 feet, and towards the end of the drainage system 
revealed nothing except the Upper Red Boulder Clay. As already 
mentioned numerous far-travelled boulders, chiefly carboniferous 
rocks and basalts, were thrown out during the excavations. Some of 
these were of large size, the largest being a block of basalt lying in the 
upper clay in Carter Lane, whose full dimensions were not ascertained, 
as it was found easier to pass the pipes beneath it than to remove 
it. The portion exposed measured about 5 feet x 2^ x 3. 
To conclude these notes I will recapitulate the points on which 
these sections seem to me to have yielded useful information. 
1. They show the rapid attenuation of the drift in a westerly direc- 
tion from the sea-coast. 
2. They prove the extension of the Basement Clay inland over some 
portion of Flamborough Head. 
3. They indicate that the Basement Clay is overlapped by the 
Intermediate Stratified Series,* which in some places rests 
directly upon the Chalk. 
4. They yield further evidence of the close connection existing 
between the Intermediate Stratified Series and the Upper 
Boulder Clay. 
My best thanks are due to S. Dyer Esq., of Bridlington Quay, 
under whose directions these works were carried out, for his kindness 
in allowing me to examine his plans, and in supplying me with 
measures and with much information with regard to some of the 
sections which I was unable to examine. 
* Vide supra cit. pp. 400 and 404. 
