HYDRON SILICATES IN ROCKS OF CONCEPTION BAY 1*1 



STRUCTURE 



The volcanic series forms the lowest member of the Algonkian 

 rocks in this region and has been mapped as Huronian by Howley 

 (1907). The volcanics at the head of Conception Bay outcrop on 



Fig. i. 



the core of a major anticline, the eastern limb of which has been 

 intruded by a huge batholith of granite. On the west side of Holy- 

 rood Bay they are also intruded by a stock of monzonite. ' The 

 rocks are in addition excessively disturbed by profound and 

 intensive faulting, and usually dip steeply. 



There is a strong probability that the line of contact between 

 the granite and volcanics at Manuels marks the approximate locus 



