﻿568 



DE. T. GEOOM AXD ME. P. LAKE ON THE [I^OV. I908, 



List of Fossils from the 

 Bryx Beds {continued). 



Murchhonia cf. turrita, Portl. 

 Platyschisma (1) sp. 

 Raphistoma cequale. Salt. (c). 



Ctenodonta varicosa, Salt. (c). 

 Ctenodonta cf. transversa, Portl. 

 Cucullella oi. lilanulata, Conr. 

 Modiolopsis postlineata, M'Coy. 

 Modiolopsis pyrns. Salt. (c). 

 Modiolopsis cf. securiformis, Portl. 

 Orthonota prora (J) Salt. 

 Orthonota cf. rigida, Sow. 



Orthoceras politum, M'Coy. 



Acidaspis sp. 

 Asaphus sp. 



Calymene senaria (CoDi-ad) Salt 



Chasmops conicophthalma (Boeck) Salt. 



Chasmops macroura, Sjog 



Homalonotns bisulcatus Salt. (c). 

 Homalonotus riulis, Salt. 



Lichas laxatus, M'Coy 



Phacops apictdatus, Salt. ( c) 



Phacops trtmcatocaudatics, Portl. 

 Trinucleus concentricus, Eaton (c). 



Tetrodella compUcata, Salt. (c). 



CO O 



(4a) Coed-y-glyn Sill. — JN'ear the base of the series just 

 described, and generally separated from the Craig-y-Pandy Ash 

 by a very small thickness of beds, there is an irregular intru- 

 sive sheet of rock which has commonly been mistaken for the 

 'Little Ash' of the Geological Survey, and is worked for road- 

 metal in Coed-y-glyn Quarry. Although it runs nearly at the 

 same horizon throughout its course, it is extremely variable in 

 thickness and sporadic in its occurrence, or at least in its exposures. 

 Its upper and lower surfaces, as seen in Coed-y-glyn Quarry, are 

 both very irregular, and it seems to be distinctly intrusive. 



The westernmost exposure of this rock in our map is near 

 Ty'n-y-pistyll, whence the outcrop runs nearly parallel to the 

 Craig -y-Pandy Ash, and is separated from it by a very small 

 space ; indeed, it is not impossible that the two rocks are here in 

 actual contact, for no intervening beds are visible. The band 

 cannot be traced so uninterruptedly as the Craig-y-Pandy Ash, and 

 there is reason to believe that it is not actually continuous through- 

 out; but it may be seen again at a little distance from the 

 Craig-y-Pandy Ash, at several points near Hafod-y-gareg. It is not 



