Vol. 62.] ROCKS OF "WESTERN - CAERilARTHEXSHIRE. 627 



ashy, with a fair abundance of fossils. Here, presumably, Prof. 

 Lapworth collected graptolites which he identified as follows : — 



Dicranograptus formosus, Hopk. 

 Bicellograptus sextans, Hall. 

 Diplograptus foliaceus, Murcb. 



Climacograptus c&latus, Lapw. 

 Climacograptus perexcavatus, Lapw. 



The following additional fossils have been obtained from a well 

 close by : — 



Dendrogrctptus sp. Corynoides curtus, Lapw. 



Climacograptus tubuliferus, Lapw. Orthis argentea, His. 



East of the Gynin, the beds are seen near the old lime-kiln at 

 Llandeilo-aber-cowyn, where Orthis argentea, His., occurs. The 

 beds here are easily recognizable, although graptolites are very rare. 

 Their passage upwards is also seen in a very good and continuous 

 section. 



Black shales of the same description have been dug from a well 

 at Foxhole, are seen in a ditch east of Division Park, and from 

 abundant debris are known to be present in the small hill or ridge 

 north of that fault, but are here evidently faulted against higher 

 beds. 



The dips north and south of the Cywyn, near where it falls into 

 the Tave, indicate an anticlinal fold of some extent. The fold 

 itself, however, has been worn away, and its place is now occupied 

 by the Cywyn Valley. Conditions pointing to the same fact are also 

 seen on the west of the Tave. 



Black shales are exposed in a small pit in the Corporation ground 

 south of Morfa-bach. Their occurrence here is accounted for by the 

 Cywyn anticline, but there is some faulting in the vicinity. 



Immediately south of Woolston Farm are several exposures of 

 black shales, some of which can be traced to the St. Clear's-Bridge 

 Fault. The beds also occur in the high bank of the Tave, near 

 Llysywig, but are not very fossiliferous. There are moreover 

 several other small exposures in the neighbourhood, which are 

 useful to point out the path of the fault. 



The beds are well and typically exposed, both in quarry- and road- 

 sections, south of Mylet. Here they are abundantly fossiliferous, 

 and are seen passing up into arenaceous deposits — rotten lime- 

 stone — full of fossils. The black shales have yielded the following 

 fossils : — 



Dicranograptus rectus, Hopk. Climacograptus minimus, Elles. 



Dicellograptus Morrisii, Hopk. Ccdlograptus (two species) ; 



Climacograptus tubuliferus, Lapw. etc. 



Some other good exposures are seen near Moelden. Here the beds 

 show signs of shearing and other disturbances. The black shales 

 pass up somewhat abruptly into rotten limestone, most of which 

 seems to have been pinched out, and a little to the east disappears 

 altogether. 



From this point to near Llanddowror there is a small synclinal 

 fold enclosing rotten Bala Limestone. Parallel to this, on the 



