THK AMl:l;lA\ M 



80 



iiinitit. The outcrop forms a narrow band between that of the 

 Onlnvician and the area of Old Red Sandston,. i,, tin- south. 



GEOLOGICAL MAP OF A PART OF NORTH WALES 



Grdovician 

 Up. Cambrian 

 Mid & lower-Cambrian 

 Granite &.Felsite 

 rchjcan Schists 



Fig. 10. MAP OF NORTH WALK* (from recent gouroM). 



In Merioneth the Lingula flags alone attain a thickness of over 

 6000 feet, while the overlying Tremadoc Beds have a maximum 

 thickness of about 2000 feet. 



Tin- Lingula flags form a continuous belt all round tin- 



