[schofield] 



ORIGIN OF THE PURCELL TRENCH 

 Plate III 



31 



Diagram showing the geology of the Furce// Trench 



Legend 



granite granod/or/te 



Carboniferous 



limestones, quartz./tes, 

 mica-sch/sts. and 

 altered volcanics 



, , Pre-Carbon/fisrous 



'II I l\ to Beltian ' f 



^ ,' / / J quartzitesj/mestonss. 

 sch Is ts 



•Sea le o-f Mil&s 



