MOORE ABXOE^IAL SECOXDAEY DEPOSITS. 



513 



centre of the basin at Bridgend, in which its greatest thickness 

 (of stratified beds) is manifest. After giving the Bridgend section 

 I propose to consider the Lias in its junction with the Carboni- 

 ferous limestone. 



In the valleY west of Bridgend the Keuper Sandstones are largely 

 worked, but their succession upwards into the Lias is not well ex- 

 posed. At the iron-works close to the west end of the Bridgend 

 Quarry a well, lately sunk for water, passed through about 90 feet 

 of blue and red marls, which, from the account given of them, pro- 

 bably represented the upper Keuper beds. The beds dip rapidly to 

 the south-east ; and between the well and the iron-works, on a 

 higher horizon, is a deep pit, which is now being filled with quarry- 

 -refuse, and contains wat^r, most likely sunk through the Ehaetic 

 beds. Above this the sides were covered for about 25 feet. Dark- 

 brown or grey nodulated limestones are then seen, about eight feet 

 thick, succeeded by about twenty beds, some of them containing 

 numerous cherty or flinty layers and nodules, which are also to be 

 found in most of the Liassic sections of the district. The fossils are 

 not numerous ; but there occurred Pinna semistriata, Pentacrinites, 

 and several specimens of Gryplicea incurva, which I left, as they in- 

 dicate the presence of the latter shell low down in the Liassic series 

 of this district. In the adjoining quarry the following important sec- 

 tion occui's taken from the west end in ascending order. The term 

 " clod " isused by the quarrymen for intervening beds of clay or marl. 



Section at Bridgend. 



ft in. 



Stone 7 



10 



Clod 3 



Stone 3 



Covered beds 4 



Stone 6 



Clod 3 



Stone 7 



3 



Clod 8 



Stone 5 



10 



Clod 1 



Stone 11 



1 



Clod 7 



Stone 7 



Clod 2 



Stone 10 



Clod 2 



Stone 3 



Clod 2 



Stone 4 



1 2 



Clod 2 



Stone 5 



4 



^tonevi'iih. My acites 10 



VOL. XXIII. PART I. 







ft. 



in. 





ft. 



in. 



Clod, 



ditto 



3 







aod 







3 



Stone 









7 



Stone 







8 



Clod 









3 



Clod 







5 



Stone 





10 



Stone 







5 



with chert . , 







4 



Clod 







2 



Clod 

 Stone 







 



1 



7 

 3 

 



Stone 

 Clod 

 Stone 







5 







3 



with Amtno- 





Clod 









3 



nite. 



' Conybeari. . I 







Stone 





1 







Clod 







5 



Clod 

 Stone 









3 



Stone 

 Clod 







1 



8 



with Gry- 







;phcBa incurva . . 



10 



Stone 







4 











7 



Clod 



1 















1 



4 

 4 



Stone 

 Clod 



1 











3 











7 



Stone 







8 













8 



Clod 







2 







1 







Stone: 



Chemnitzia, 













10 



Finna 1 







Clod 









2 



Clod 



1 







Stone 









7 



Stone: 



Montlivaltia 



4 



Clod 









3 



Stone 



with nume- 





Stone 









5 



rou8 



univalves, 





Clod 









3 



Finna, and Gry- 





Stone 









5 



phaa incurva ... 2 







Clod 

 Stone 







 



3 



8 



Clod 

 Stone 











3 





6 













2n 





