MOORE ABNORMAL SECONDARY DEPOSITS. 



519 



List of Organic remai 



In the lowest beds. 

 Hinnitas, sp. 

 Pecten Pollux, TfOrh, 

 Plicatula acuminata. 

 Lima gigantea. 

 Lima tuberculata. 

 Pinna semistriata, Terq. (P. insignis, 



Taw.). 

 Plicatula Hettangiensis, Terq^. 

 Modiola producta, Terq. 

 Ostrea intusstriata. 



In the Ostrea-heds. 

 Heraipedina Bowerbankii, Wright. 

 Ampullaria carinata, Terq. 

 Melania (Pterocera) dubia, Terq. 



turbinata. 



abbreviata. 



Turritella Dunkeri, Terq. 



Jenkeni, Terq. 



Tiu-bo rotundatus, sp., Terq. 

 Montlivaltia. 



ns from LlanhetJiian. 



Thecosmilia Michelini, Terq. 

 Area pulla, Terq. 

 Astarte cingulata. 

 Cardita Heberti. 

 Cardinia Listeri, Stutch. 



, sp. 



Cucullsea similis, Terq. 



Hettangiensis, I'erq. 



Modiola minima. 

 Ostrea liassica. 



In the Ammonites-planorbis beds. 

 Ammonites planorbis. 

 Pecten Pollux, BOrb. 

 Lima tuberculata, Terq. 



gigantea. Taw. 



Ostrea arietis, Querist. 

 Pinna semistriata, Terq. 

 Ampullaria planulata, Terq. 

 Melania (Pterocera) dubia, Terq. 

 Neritopsis exigua, Terq. 



In this, as iu all other sections in which the Ostrea-beds are found, 

 those shells occur in myriads, and the beds generally present the 

 same Liassic character; but in some loose thin blocks from this 

 horizon on the Llantrissant railway the bed is conglomeratic and 

 contains a multitude of greenish chert pebbles in a grey matrix, and 

 assumes the character of the Sutton Stone. 



5. Laleston Quarry. — The Ostrea-beds are also well exposed in 

 the sections mentioned by Mr. Tawney at Laleston and at the Stormy 

 Cement Works. At the base of the former section that gentleman 

 notices a bed similar in character to the Sutton Stone, and having 

 between it and the Ostrea-beds some indurated marls containing 

 Monotis decussata. As this quarry is not worked, it is difficult to 

 examine the lower beds or to compute their thickness. The only 

 block I could get out contained an abundance of Lima gigantea, 

 Ostrea intusstriata, and 0. liassica. There are also sections of small 

 univalves, casts of Cardinia, and Monotis decussata. The bed is 

 also crowded with a coral, of which sections in the fracture only can 

 be seen, the Sutton-stone species and those of Brocastle being 

 absent. The indurated marls resting on this are one foot thick, and 

 would be of much interest could they be worked, as they contain 

 most perfectly preserved impressions of plants, together with Ento- 

 mostraca and Monotis decussata in abundance. Mr. Tawney has in- 

 ferred from the presence of this shell that the lower beds are below 

 the Rha^tic series ; but my discovery of it in higher zones, as it 

 occurs also in the bed under notice, shows that it may mislead. 

 From the presence of Ostrea liassica, I believe this bed must be 

 classed with the others on that horizon, and that it will be found to 

 occupy a lower position in the Liassic series than the beds of Sutton, 

 Southerndown, and Brocastle. 



From Dr. Pritchard's quarry in the same village I obtained a 

 slab from the Ostrea-beds containing four of the most beautiful 



