34 
LAMPLUGH : GLACIAL SECTIONS. 
from about 20 feet above the beach to beach-line, and evidently 
lapping round and over lumpy and projecting bosses of the 
lower part of the clay, — passing over them sometimes at a high 
angle ; — so that the line traced by this band in the cliff, if called 
a ' horizon ' is decidedly hilly in aspect. 
At the points marked B in the sections, the band passes into, 
or admits, seams of fine clean sand, which appear to have been 
sheltered under the lea of a boss of the clay-bed, as they are usually 
sharply cut into, and cut off, by the overlying clay. I have not 
yet been able to ascertain whether the direction of the leaside is 
always the same, but in two cases the sand rested on the western 
slope of a knoll. 
Owing to the same reason as with the gravels — the deficien- 
cies of my early section — I have not been able to trace the course 
of the band in the now hidden part of the section, though its 
continuance is indicated by the sand-seam in the midst of the clay, 
and I also find reference in my notes to the ' two foot seam,' 
The boulder clay above the band has suffered severe and 
irregular erosion, being in some places 10 or 12 feet thick, — 
in others nearly or quite, cut through, as at F in Fig. 1. The 
erosion is generally deep where the peculiarly disturbed junction 
with the gravel (26), is well developed. 
Beyond the limits of my section northward, the Purple 
Boulder-clay, following the upward slope of the Basement Clay, 
comes to the surface ; southward, though holding, on the whole, 
a slightly higher level, it rises and falls irregularly as in the 
section. 
The Laminated Clay (4). The laminated clay on which the 
Purple Clay rests does not in this section, nor indeed elsewhere, 
rise above the level of the highest tides, and is best developed on 
the beach a little distance from the cliff. Its course thereon is 
shown by the dotted lines below the beach line in Fig. 1 ; these 
lines form a rough ground plan of the beach betwean tide marks. 
