Lhvyn- 

 ffynnon 



Pen-y- 



geulan 



. Journ. Geol. Soc. Vol. LXIL PL XLYIII. 



bach 



Railway- 

 bridge 



I Pont Pandy 



J Pant-glas bach 



Natural 

 Arch 



Railway- 

 bridge 



Talerddig 



cutting 



'f? 



'iP y 



Fig. 2. — Generalizeties to the mile. 



o 



Be 



Scale of Miles 



Afon Cwm CalcK Talerddig 



S.E. 



$^&&%z>- V Be ^~>. ^ 



