150 
portions, may be accounted for by denudation having removed 
all the upper beds from the N. side of the valley after they had 
been deposited. 
Passing then downwards from the plateau to the bottom of the 
valley, about 307 feet above sea level, several interesting features 
are observable. The tramway runs along the Fuller’s Earth, 
from 180 feet to 150 feet thick, and its wet and greasy nature is 
only too plainly perceptible to any one walking down the side. 
At or near the bottom level it cuts through Inferior Oolite rock 
with the “ Midford Sands” at the base. Several trial holes for 
stone here sufficiently indicate this. At one excavation on the 
side of the Knoll overlooking the works, the rock immediately 
resting upon the Sands is simply a mass of shells, Rhynconella 
spinosa, Trigonia and Ostrea Marshii abounding. The top of 
this Knoll, 163 feet above the valley and 174 feet from the 
plateau, is therefore, undoubtedly Inferior Oolite. *Some 50 feet 
below this Knoll, and 300 feet to the E. on the 400 feet contour 
line, a section facing N. has exposed several beds tilted to the E. 
and dipping at an angle of 64° in that direction. It was 
naturally supposed at first that these belonged to the same 
members of the Oolitic series as those immediately above, .¢., the 
Inferior Oolite, but, on examination, I discovered this was not 
the case, for, on looking closely, a portion of limestone in the W. 
corner, yellow on top and blue in the centre, with asmall patch of 
clay, yellow on surface and blue beneath, was at once recognised 
as the same bed as that on the top of the plateau, i¢., the 
lowest bed of the “ Rags” resting on the Fuller’s Earth. So that 
we had here a mass of Great Oolite beneath the Inferior Oolite, 
a most abnormal position. How is this to be accounted for ? 
There must have been a landslip in past times, bringing down a 
mass of the Upper beds with some Fuller’s Earth attached to 
them, and pitching them down almost end on in their present 
* The white cross in Plate No. 1 (from Photograph taken by 
Mr. George Powell) marks the position of the landslip. 
