Quart. Journ. Geol. Soc. Vol. LXII, PL XXIII. 



Map of the 



IGNEOUS and ASSOCIATED ROCKS 



of LLANGYNOG. 



Scale:- 3 inches = / mile. 



SOO yards '/2 / mile 



Bala Limestone 



Dicrtmogm 



Shales 



Shales)/)../,;/';,/,, 

 Grits f Beds 



Andesites (Lavas & Tuffs) 



pj-ffrj Porphyry 

 H Diabase 



Thick black lines indicate faults and thrusts. 

 Vertical beds shown thus ^C 



