Quart. Journ. Geol. Soc. Vol. LXXIII, PL XII 



Fig. 1. — Craig Llanishen, Cefn-On, and the intervening 

 strike-valley : looking westwards. 



Fig. 2. — The scarp-face of Cefn-On at the head of 

 Cwm Draethen : looking eastwards. 



Fig. S. — Machen Qitarrg, etc., looking north-eastwards 

 across the Rhgmneg Valleg. 



T. F. Sibly, photo. 



