LAMPLUGH : GLACIAL SECTIONS NEAR BRIDLINGTON. 277 
corresponding to what is known as the " Hessle Clay," in sections 
further south. Between the Basement and Lower Purple Clays there 
was in some parts of this section no intercalary bed whatever, and in 
others, a very thin wash of sand and gravel (4b. ) : but the division was 
in all cases sharply and distinctly marked by differences of colour and 
texture. Between the Lower and Upper Purple Clays there was a seam 
of clean-washed sand and gravel (3c.) varying in thickness from a 
mere trace to six feet. This gravel corresponds to the similar bed 
(2a.) shown in fig. 2 of Part L, and is probably on the same horizon 
as the " stratified band" (3c.) in the Purple Clay of the South Sands, 
as described in Part IL (fig. 1.) If it [were very closely searched, 
water worn crumbs of shelly matter could be collected from it ; but 
these fragments were so small and so rare that I do not think they 
were any proof of marine conditions during the formation of the seam. 
The Boulder-clays above the Basement Clay possess most of 
their characters in common, and are all of the type of the " Purple 
Clay," which has been fully described in my previous papers. They 
are stiff brownish or purplish clays, with a not very numerous 
sprinkling of angular, sub-angular, and rounded stones. In the 
lower band sporadic fragments of shells occur, of the same species as 
those found in the Basement Clay. 
The various beds of this section lay comparatively regularly, and 
showed few signs of the confusion that existed in the adjoining cliff, 
where, as shown in Part L, the clays and gTavels were almost inex- 
tricably entangled. The interposition of Sands Cut ravine, and the 
obscured ground bordering it, has prevented clear observation of the 
commencement of these disturbances, but, as pointed out in the con- 
clusion to Part I., these movements probably took place during the 
formation of the ' Sewerby Gravels,' which are absent from this section. 
This absence of stratified beds above the Boulder-clay, and the 
correspondingly greater development of the clays, are the chief points 
of difference between our section and those illustrated in my former 
papers, Parts 1. and II. This difference is not, I think, due to 
erosion, though erosion, acting upon a ready-made feature, may have 
accentuated it. 
The central parts of the town of Bridlington Quay stand on a 
