Yol. 62.] ROCKS OF WESTERN CAEEMAETHENSHIRE. 



639 



Fee vosites fibrosa, Gold f . 

 Hemicosmites rugatus, Forbes. 

 Hemicosmites oblongus, Pander. 

 Petraia, sp. 

 Crinoid-f'ragments. 

 Calymene cf. Blumenbachii, Brongn. 

 Phacops cf. Brongniarti, Portl. 

 Homalonotus bisulcaius, Salt. 



Orthis calligramma, Dalm. 

 Orthis elegantula, Dalm. 

 Orthis tesiudinaria, Dalm. 

 Orthis biforata, Scbloth. 

 Leptcena sericea, Sow. 

 Leptcena tenuicincta, M'Coy. 

 Ecculiomphalus Bucklandi, Portl. 

 etc. 



(0) Slade Beds. — These beds are well represented in the area, 

 but the line separating them from those of the stage below cannot 

 be drawn with any degree of confidence, the upward passage being 

 very gradual and devoid of any definite dividing-break. The 

 mudstones and shales are undistinguishable from those of the 

 Kedhill Series, but the bands of limestone (usually weathered) 

 which occur in them, and the typical assemblage of fossils in the 

 higher part, are the only indications available that the higher stage 

 has been reached. 



It is very probable that beds of this age occur near Heol-down, 

 and Lower Cress well, and also on Maesgwrda Hill, but there is no 

 satisfactory exposure. There is, however, a good little section in 

 an old quarry west of Cwmdwr, near Llanddowror, where some 

 bands of calciferous shales and mudstones are exposed. The rock 

 is much crushed, and dips south-westwards. Some bands are 

 crowded with Favorites fibrosa, Goldf. and Phyllojiora Hisingeri, 

 M'Coy. Other fossils occurring here are : — 



Crinoid-fragments. 

 Tentaculites anglicus, Salt. 

 lllcenus sp. 



Calymene Blumenbachii, Brongn. 

 Trinucleus seticomis, Eaton. 



Glauconome disticha, Goldf. 

 Strophomena rhomboidalis, Wilck. 

 Leptcena sericea, Sow. 

 Orthis elegantula, Dalm. ; etc. 



There are several good exposures near Eedgate ; one in the wood 

 to the north shows one of the bands of limestone, which is very 

 rotten here, but crowded with fossils. 



The same beds come out on the main road, at the first rise to the 

 west. These sections have yielded crowds of Favorites fibrosa, 

 Goldf. and Phyllopora Hisingeri, M'Coy : Trinucleus seticomis is 

 also very common. Other fossils collected here are : — 



Strophomena rhomboidalis, Wilck. 



(abundant). 

 Leptcena sericea, Sow. 

 Leptcena, quinquecostata, M'Coy. 

 Orthis calligramma, Dalm. 

 Orthis testudinaria, Dalm. 

 Orthis porcata, M'Coy. 

 Orthis elegantula, Dalm. 



The same bands are again exposed near Pant-y-iar, where fossils 

 of the usual type are fairly abundant. 



At Cnycau there is a roadside section showing some very 

 fossiliferous mudstones and bands of rotten shelly limestones. 



Glyptocrinus basalts, M'Coy. 

 Tentaculites anglicus, Salt. 

 Calymene Blumenbachii, Brongn. 

 lllcenus Murchisoni, Salt. 

 lllcenus Boivmanni, Salt. 

 Trinucleus concenlricus, Eaton. 

 Glauconome disticha, Goldf. 



