VOL. XIV. (1) MENDIP ARCHIPELAGO Te 
Cornwell farm the pve-planorbis beds are again visible. 
The remarkable feature of the pve-planorbis beds of 
this district is that, though in contact with the 
Carboniferous Limestone, they often present their normal 
characters.‘ In some places they become conglomeratic. 
In old quarries, immediately west of the village of Down- 
side, are breccia-conglomerates, the cementing material 
of which is similar to pve-planorbis sediment. There 
seem to be no fossils, except a few derived from the 
Carboniferous Limestone. This conglomerate is apparently 
thin, but above it are more massive conglomerates of 
Lower Lias age, with fragments of an Ostrea. The 
cementing material is quite different, being similar to the 
normal Liassic strata of the district, and the pebbles are 
larger and more rounded. A little to the north-west of 
Oatfield Farm, crops out an interesting exposure in an 
old pond. At the base are hard fve-planordis limestones, 
with small derived fragments of Carboniferous Limestone, 
and containing abundantly Modiola minima and a little 
galena. Separated by a clayey band, come Liassic strata, 
more compact than the Downside beds. 
Pre-planorbis beds crop out at Hartcliff Rocks, con- 
taining a bone-bed devoid of limestone pebbles. With 
the fish remains were a few poorly preserved Lamelli- 
branchiata. The surface ornamentation of a Pectex would 
lead one to refer it to the species va/onzenszs, and there 
was also a Cardinia.’ 
South of Freeman’s Farm, I found evidence of the 
presence of this bone-bed in a pond, deepened about the 
time of my visit (November, 1899). The fish remains 
were in a slightly pyritic matrix, with numerous fragments 
of Pecten valoniensis. The included organic remains 
1 This appears to be the case in the Harptree district also. Vide “ Jurassic Rocks, 
etc.,” vol. iii. (1893), p. 125. 
2 These fossils were kindly determined for me by Dr. F. L. Kitchin. 
