SALTER AND AVELINE ON THE CARADOC SANDSTONE. 71 



Pentamerus oblongus. Abundant everywhere. 



undatus, ****. 



lens, ****. 



Leptajna transversalis, *. 



- — — Grayii. In shales, Shineton Coppice. 



Crania impUcata ? Morrell's Wood. 



Modiolopsis, Clidophorus, Murchisonia, Turbo, Scalites, Euom- 



phalus, and Orthoceras occur rarely, and are all more or less 



doubtful species. 

 Pterotheca (transversa? or an allied species). Morrell's Wood. 

 Petraia, wide and short species. Shineton Coppice ; Kinley. 

 Petraia bina, ***. 



Halysites catenulatus. Very rare, near Stone Acton. 

 Stenopora fibrosa, **. 

 Favosites alveolaris, *. Morrell's Wood. 

 Ptilochctya (dichotoma?). 



8. Purple shales. — Wherever the section is well-exposed these 

 shales are to be seen lying beneath the grey rubbly "Wenlock shale, 

 and above the Pentamerus beds. They occur on the north bank of 

 the Onny just above the Longville foot-bridge ; in the brook at 

 Ticklerton ; vpest of Hughley ; the brook at Belswardins ; and north of 

 Buildwas. They are from 200 to 400 feet in thickness, and in some 

 places contain bands of fine blue micaceous sandstone. Fevv^ fossils 

 have been found. The following occur at one or other of the above 

 localities : — 



Beyrichia tuberculata, *. Strophomena pecten, **. 



Leptsena laevigata, ***. Atrypa reticularis, *. 



transversalis. Rhynconella furcata, *. 



Orthis biloba, **. Petraia bina, **. 



This peculiar red shale may also be seen near Choulton Bridge, at 

 the southern end of the Longmynds, occupying the same position 

 betvFeen the Pentamerus beds and the true Wenlock shale ; and the 

 section there is consequently in accordance with that under Wenlock 

 Edge ; — the fossils are the same in both cases. 



9. Wenlock shale. — On the banks of the Onny, below the foot- 

 bridge, as above stated, the Wenlock shales are exhibited ; but not 

 very conspicuously. They readily yielded the following fossils : — 



Phacops caudatus, var. longicau- Theca anoeps, Salter. 



datus, **. Loxonema elegans, M'Coy 1 



Calymene tuberculosa, **. Orthoceras subundulatum. 



Beyrichia tuberculata, *. Graptolithus priodon, **. 

 Cardiola interrupta, **. 



The Wenlock shale, characterized by the above and other common 

 species, extends from hence to Buildwas, and along the whole line 

 appears to dip conformably with the Pentamerus beds. If it over- 

 laps them at all, it can only be at the south end of the Wenlock 

 escarpment, where from Sibdon to Corston the shale lies against the 

 lowest grits (No. 2), without the intervention of the Pentamerus 

 beds. Around the Longmynd, however (see the Paper above re- 

 ferred to, vol. iv.), the Wenlock shale often rests on the conglo- 

 merate beds without the intervention of the limestone, and often on 



