686 



MISS E. M. E. WOOD 013 THE 



[Nov. 1906, 



these beds should be distinguished as the zone of Monograptas 

 fimbriatus. 



At this point there must be, as in the Twymyn near Dolgadfan, 

 a fault dividing the Llandovery Beds from the Tarannon, but having 

 a still greater throw. 



Pachdre Eeds(Aa). (Zone of Dimorphograptus Sivanstoni.) — 

 Wherever the rocks are seen to the west of this locality, they 



