516 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



ft. in. 



Stone 9 



Clod 8 



Stone 1 



9 



Clod 7 



Stone 7 



Clod 2 



Stone 8 



Clod 2 



Stone 7 



Clod 6 



Stone 9 



Clod 4 



Stone with Gry- 



jphcea, Ammonites 



Sauzimius 9 



Clod: Belemnites... 4 



Stone 7 



Clod 7 



Stone 10 



Clod 2 



Stone 8 



10 



Clod with. Gryphma 7 

 Beds curved and 



faulted 50 



Stone 



Clod !!"!!!!!!!!!!! 



Stone 



Clod 



Stone 



Clod 



Stone 



Clod 



Stone 



Clod 



Stone 



Clod !!"!!!!!""!!! 



Stone with Belem- 

 nites acutus, Pec- 

 ten sublcBvis 



Clod 



Stone 



Clod 



Stone 



Clod 



Stone 



Clod 



ft. in. 



9 



4 



10 



2 



1 1 



1 



4 



1 



1 



1 



9 



3 



7 



6 



5 



4 



10 



2 



6 



4 



1 3 



6 



9 



1 



ft. in. 



Stone 1 3 



Clod 9 



Stone 6 



Clod 4 



Disturbed and co- 

 vered beds 15 



Stone 6 



Clod 4 



Stone, Ammonites 

 Sauzianus, Chem- 



nitzia, &c 6 



Stone 4 



Clod 3 



Stone 5 



Clod 2 



Stone 4 



: GryphcBa in- 



curva, Cardinia, 



&c 6 



About twenty-five 

 somewhat irre- 

 gular beds, with 

 Gryphcea, &c., 



about 12 



(476 beds.) 



Owing to the peculiar conditions under which the beds in this 

 section have been deposited, I find it almost impossible to establish 

 any precise horizons in order to compare it with other Liassic districts. 

 It is to be observed that the Gryplicea incurva passes almost through 

 the whole series, that Ammonites Conyheari occurs very low down, 

 and A. BucJclandi about the middle of the section, whilst towards the 

 top are numerous A. Sauzianus and A. semicostatus, which indicate 

 the higher members of this series. The Ostrea-beds, so well marked 

 at the base of the Lias in other sections, are not so here. From the 

 palaeontological evidence I should therefore incline to the opinion 

 that the greater part of this section represents the Am^nonites^ BucJc- 

 landi beds, and passes into the still higher members at the top. 



Mr. Tawney, in his paper (p. 79) states that the upper beds belong 

 to the Middle Lias ; but this is an error, as everything in this section 

 belongs to the Lower Lias, no Middle Lias having yet been recog- 

 nized in Wales. 



Since the above was written, I have had an opportunity of com- 

 paring the fauna of the upper beds at Bridgend with that described 

 by MM. Martin andTerquem from the continental " Infralias " beds. 

 Below are given the species I have obtained from beds in which are 

 Ammonites Sauzianus and A. semicostatus, though no doubt the Hst 

 may be increased. I was scarcely prepared for the interesting fact 

 that the faunae are evidently identical ; but such is the case, so far 

 as my series of fossils is concerned. 



