DEVONIAN GROUP. 113 



The Clifis under the Castle at Lanstiphan, near the month of the 

 Towey. In the vicinity of Hay, and in the valley of the Tsk, 

 near Abergavenny. 



Fishes. — Cephalatpis and OncAtu. 



3. TllESTOXE. 



Rndy laminated, hard, reddish or green, micaceous, quartzose sand- 

 stones, which split into tiles ; with occasional beds of reddish 

 shale. 



In the gorge of the Teme, between Ludlow and Downton Castle, 

 near the Tin Mill. Oakley Park, Ludlow. Horeb Chapel ; the 

 Valley of the Cwm Dwr, between Trecastle and Llandovery. 



Fishes. — Diptenu, &c., and remains of Testacea. 



In Scotland this system is also largely developed, iu 

 Caitlmess and Cromarty, as described by ^Ir. ^liUer. In 

 Dura Den, south of Cupar, in the valley of Strathmore 

 and adjacent district, as observed by Mr. Lyell, {ElemenU 

 of Geology, vol. ii. p. 148.) 



The mineral characters are ver\- similar, and the divi- 

 sions appear to be characterized by the same genera of 

 Fishes, but remains of Testacea have scarcely been observed; 

 the lowest division, however, contains a larger number of 

 the remains of Fishes, than the equivalent beds in England, 

 and belonging to the genera, Plericthys, Coccosteus, Diplcp- 

 tents, Diptenis, CJieiracanthus, &c. 



Strata of the same age have been recognized as occur- 

 ring in Devonshire, but present a different lithological 

 aspect, consisting of green chloritic and quartzose slates 

 and sandstones, with some conglomerate and limestones, 

 and contain a great abundance of the remains of Testacea 

 and Crustacea, those of Fishes being on the other hand 

 very scarce. Xumerous species belonging to the families 

 Brachiojpoda, Cephalopoda, Conchifera and Gasteropoda, 

 have been collected. 



