638 ME. D. C. EVANS ON THE ORDOVICIAN [ISToV. 1906, 



The beds are also frequently exposed near Moor, Tadil, and 

 Maesygrove. In the watercourse between the latter place and 

 Moelden, the beds are traceable to within a short distance of the 

 Dicranograptus-Shales, indicating pretty nearly the locality of 

 the fault. The beds are also well seen at Maeslan and in the 

 Pen-y-graig and Cwmdwr lane, dipping northwards at both places, 

 and broken by faults seen in section in the lane. 



Near Talfan Cottages is a small quarry on the roadside, where 

 the beds are somewhat coarser in grain and dipping northwards. 

 They are faulted against lower beds on the north and south, in 

 the immediate vicinity. Favosites fibrosa, Goldf. ; Phacops cf. 

 macroura, Sjogren ; Trinucleus concentricus, Eaton ; Ortliis calli- 

 gramma, Dalm., etc. occur here. 



The lane leading to Talfan affords a continuous exposure, but 

 fossils are very rare. Here the beds are faulted on the south against 

 Dicranograptus-~Beds. and on the north, a short distance from the 

 farmyard, against Sholeshook Limestone (/3). 



There are several exposures near Ferin-ban. The one on the road 

 leading to Cnycau shows the beds in contact with the Old Red 

 Sandstone, and dipping southwards at a high angle. It is probable 

 that a small thickness of beds of the next stage is present here. 

 The character of the rock and the fossils suggest as much. 

 • A quarter of a mile up the road the Llancldowror limestone comes 

 out with a low southerly dip. This is seemingly a portion of the 

 Llandeilo-aber-Cowyn anticlinal fold. The ground is, however, 

 much cut up by faults about here. 



At the entrance to Penlan the beds are almost horizontal. An 

 exposure of 200 yards or more along the road in the direction of 

 Cnycau shows the gradual steepening of the dip, but fossils are 

 very rare. 



West of Parcau the beds are frequently exposed. Sections are 

 seen in the lane leading to Pont Parcau. The few fossils that do 

 occur are of the usual type. 



Exposures are abundant near Penlan, Eaynor, and Pentrehowel, 

 and in the woods near Teiau-bach. The road-exposure west of 

 Pentrehowel has yielded 



Favosites fibrosa, Goldf. 

 Ttilodictya dichotoma, Portl. 

 Trinucleus concentricus, Eaton. 

 Ill anus sp. 

 Orthis calligramma, Dalm. 



Orthis fiabellulmn, Sow. 

 Orthis bi for at a, Schloth. 

 Leptcena sericea, Sow. 

 Cyrtoceras sp. 



The beds occur also at Clog-y-fran, where they are much disturbed 

 by folding and faulting. Along the lane to the south the dip 

 continually varies, and a little fold is seen in section in a small 

 exposure in the field at the bend in the road. A few yards to the 

 south-west the beds are faulted against the arenaceous limestones, 

 having been thrown down quite 100 feet. Eossils collected in this 

 locality include : — 



