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of the formation throws off the water, and a well about six 
feet deep is amply supplied, and at Ferris Court, only a mile 
distant from Stroud Hill, the water level is stated by Mr. J. H. 
Taunton to be near the surface, while at Stroud Hill it igs in 
the lower part of the formation. 
The blue Marl is succeeded by a bed of blue and buff Shale, 
laminated, with horizontal cleavage, fossiliferous, the fossils 
being similar in character and condition to those in the bed 
below (No. 5 in Section). Myacide and Cyprinide, in the form ' 
of casts, are common, and the Fossils generally agree with 
those of the Great Oolite. Above this the Marl and Shale 
gradually assume a lighter colour, and become buff and brown ; 
the upper part contains Ostrea acwminata in immense abun- 
dance; Placunopsis socialis and Pecten vagans are common. 
Bands of cemented valves of Ostrea acuminata occur, varying 
from one to nine inches in thickness, to the exclusion of other 
fossils. On the slopes these bands are found broken up and 
partially disintegrated. I have obtained from this part of the 
formation a single specimen of Ammonites gracilis, Buck., a shell 
hitherto found in the Stonesfield Slate. 
The upper portion of the formation consists of a sandy Clay 
alternating with beds of Sandstone, brown on the surface, blue 
internally, and closely resembling the Stonesfield Slate, except 
that it is less laminated. The passage from the Fuller’s Earth 
to the Stonesfield Slate is shown in the disappearance of the 
Clay and the greater development of the Sandstone beds, which 
assume a more persistent character. 
The Stonesfield Slate, as shown in the Section, represents 
the western edge of the formation. It is thin bedded, but it 
is too consolidated and irregular, and not sufficiently lami- 
nated for roofing tiles, and is used only for road making and 
field walling. It contains numerous pieces of wood and plant 
remains, but the impressions are badly preserved. A thin 
whitish stratum near the middle of the formation splits into 
thin flakes, the surfaces of which are covered with impressions 
of plant detritus. Among the fossils I have found part of a 
