518 PEOCEEDINGS or THE GEOLOGICAL SOCIETY. 



Brocastle ; and altogether I am disposed to place these heds below 

 those sections. 



4. Llanhethian Quarries. — In the quarries at Llanbethian, about 

 a mile south-A^est of Cowbridge, the Ostrea liassica beds are present, 

 and show that here there are present the lower horizons of the 

 Camel section. In the upper bed of this quarry this determination 

 is also confirmed by the presence, for the first time in this neigh- 

 bourhood, of Ammonites planorbis, associated with Neritopsis exigua, 

 Terq., and Melania. The beds are, in ascending order : — 



Section at Llanhethian Quarry. 



ft. in. 

 ^tone,with. Pinna semistriata, Terq. (P. insiffnis,Taw.), Pecten 



Pollux, Plicatula acuminata, Lima gigantea, &c 5 



4 



Grrey marl 4 



Stone 6 



— : 1 



3 



Modiola Hillana 4^ 



Stone 8 



2 



6 



3 



Clay 1 



' Stone : Ostrea liassica, Area 8 



4 



Thecosmilia and Montlivaltia 4 



4 



3 



: Lima gigantea, Area, &c 4 



Six thin beds with many Cardinia 1 



Stone 4 



-^ Stone with Carc^ma 5 



Stone 4 



4 



4 



4 



3 



8 



3 



^ •- with Cardinia &c 9 



E,ubbly Stone with Pecten Pollux, Lima duplicata, L. gi- 

 gantea 1 



Stone 5 



: Cardita, Area, Lima gigantea 4 



Clay 1 



Stone : Cardita, Lima, &e 7 



: and uniyalves 6 



: Melania 6 



: Chemnitzia &c 4 



6 



8 



Twenty beds of about 10 feet, which could not be traced, then 

 succeed ; and above these, in the western corner of the quarry, the 

 highest contains many Ammonites planorbis with Neritopsis exigua, 

 Melania, &c.. 



