Yol. 62.] HOCKS OF WESTERN CAEEMAETHENSHIEE. 



637 



The beds are much exposed at Faynor, both in quarries and other- 

 wise. They come out in the watercourse leading from the yard, 

 past the well to the bottom of the dingle, where they are slightly 

 disturbed by a fault which cuts them off a little to the south of this 

 point. 



About halfway up the hill in the direction of Penlan Farm, they 

 are again seen in a small quarry where they are nearly horizontal ; 

 but in the lane immediately to the north they dip northwards at a 

 low angle. The upper beds are seen at Penlan, where they pass up 

 into the next stage, the beds of which are here nearly horizontal. 



A small patch is exposed at Parcau, about half a mile to the west. 

 Here the beds dip gently south-westward, and pass up into the next 

 stage immediately west of the yard. 



(y) Redhill Beds. — The arenaceous limestones are seen 

 passing up into this stage near Clog-y-fran Bridge. The calcareous 

 matter gradually disappears, forming, at last, merely small lenticular 

 masses of sandj T limestone in blue-grey shaly mudstones. The 

 lenticles are generally full of fossils, but the mudstones themselves 

 are very barren.. These mudstones on weathering assume the 

 characteristic olive-green colour. Fossils are usually rare all 

 through them, except in isolated patches : that is, there are no 

 continuous fossiliferous bands. 



Rocks of this age are abundantly exposed in the south of the 

 anticline, and are readily distinguishable from those below ; but to 

 fix their exact upward limit is not an easy matter, if at all possible. 



At Parc-y-graig, north of Foxhole, a small section of these beds 

 is seen in the bank of the Tave, but fossils are very rare here. 

 Only a few specimens of Orthis and crinoid-fragments occur. 

 Abundant debris is seen on the hill south of Pant-dwfn, under 

 conditions which assist in locating the fault that brings the beds 

 against Dicranor/raptusShales (p. 629). 



On the west of the Tave the beds are exposed near Morfa-bach 

 in two small quarries. In the smaller and lower quarry the beds 

 are of the usual type, and fossils are rare. A few stray specimens 

 of Leptcena sericea. Sow. and fragments of Favosites occur. This 

 section is fairly high up in the series. In the upper quarry are 

 bands of weathered limestone, containing crinoid-fragments. There 

 is a small thrust from the north shown in section here, and it is 

 suggested that the calcareous beds belong to a higher stage. 



In the yard at Lower Cresswell is a small exposure, which has 

 yielded a good number of fossils, including : — 



Favosites fibrosa, Goldf. 

 Ptilodictya dichotoma, Portl. 

 Hemicosmites rugatus, Forbes. 

 lllcenus Bowmanni, Salt. 

 Trinucleus concentricus, Eaton. 

 Trinucleus cf. seticomis, Eaton. 

 Homalonotus sp. 



Calymcne sp. 



Orthis calligramtna, Dalra. 

 Orthis biloba (?) Linn. 

 Orthis elegant tola, Dalm. 

 Orthis tcsit'dinaria, Dalm. 

 Leptana sericca, Sow. 

 Orthoceras gracile, Portl. ; etc. 



