﻿Section A. — From Morfa Bychan to Fach-goch. {Scales: horizontal and vertical, 6 inches = 



Journ. Geol. Soc. Vol. LXVI, PI. XV. 



Maentwrog- Series 



Section B.— From Glan-byl to Pen yr Allt. (Scales : horizontal and vertical, 6 inches = i mile.) 



Andesitic Volcanic Series 

 Exposure Series 3 



Andesitic Volcanic Series 

 Exposure Series 4 



Tyddyn Dicwm[ Slates & Pisolitic Iron Belt 



Dolerite of Tramroad above Penmorfa 

 and of Tyddyn Dicwm-uchaf 



1 Jrey Slate Series 



Gabbroid Dolerite of Tremado'c 



Vesicular Andesites 



