128 
as the highest bed of the Inferior Oolite of the Cote d’Or. The 
list of fossils from that stage contains many of those found in 
the Clypeus Grit, including Clypeus Plot, Lima gibbosa, and 
Pholadomya Heraulti, and I regard it as probable that the 
Clypeus Grit forms part of the stage. 
The Fuller’s Earth._So few opportunities occur for examin- 
ing the beds of the Fuller’s arth that no complete Section 
of them has yet been made, and it is probable that sections 
at any given localities would be found to vary considerably 
from each other. In Stroud Hill the lower portion of the 
formation (No. 6 in Section) consists of a blue Shale occasion- 
ally consolidated, and in this condition, when dry, having a 
conchoidal fracture. The shaley part is very fossiliferous, 
but the shells are, with one or two exceptions, reduced to a 
dark pigment, so that they cannot be identified without great 
difficulty ; one of the exceptions is Lima duplicata, which is 
so well preserved that the shell appears in its original con- 
dition. Posidonomya Opalina Quen. occurs in great numbers. 
One of the most abundant fossils in this part of the 
formation is that of a small crustacean, Glyphea pseudo-scyllarus. 
It is very fragile, and when found it is constantly separated by 
the cleavage of the matrix into two parts, one part adhering to 
each side. I have also found a single claw of the genus Magita. 
Several specimens of a small but new Trigonia (T. Witchella 
Lye.) have been collected, and a few examples of T. imbricata, 
both of which species have been recently figured by Dr. Lycett 
in the Memoir of the British Fossil Trigonie, published by 
the Paleontographical Society. 
In Stroud Hill the percolating water is thrown off by this 
bed, the more porous beds overlying it acting as a sponge, 
by which the water is held until gradually let out in the springs. 
Were it not for the faults which let a portion of the water 
escape down to the Upper Lias, a much larger quantity would 
be thrown off by the Fuller’s Earth, and the slopes of the 
Cotteswolds would be exceedingly well watered. The retentive 
nature of the Fuller’s Earth varies considerably even in short 
distances ; thus at Stancombe Ash, near Bisley, the upper bed 
