656 GEORGE W. BAIN 



Granite Gneiss* 

 Per Cent 



SiOa 59 89 



AI2O3 17.70 



Fe203 1.95 



FeO 2.71 



CaO 2.53 



MgO 1.56 



MnO 



K3O 5.83 



NaaO 5.74 



TiOz 0.96 



P2OS 0.17 



CO2 0.39 



H2O o. 29 



99.92 

 Analyst: Dittrich 



* Annual Report of the C.G.S., Part O, iSgg. 



THE ZONAL ARRANGEMENT OF THE ROCK TYPES 



The field relations show a zonal arrangement of rock types 

 brought about by pegmatitic influences of the Lauren tian granite on 

 the Grenville limestone. The zonal arrangement is as follows : 



Crystalline Limestone 

 Diopside, Wollastonite Skarn Rock 



Feldspar. Garnet Rock 



I 

 Biotite, Garnet Gneiss 



Biotite Gneiss 



I. 

 Granite 



In the field work, care was exercised in following the same bed, 

 and where it was necessary to change from one bed to another the 

 new one was picked up where it was almost identical with the one 

 being studied. The changes outlined may be taken to represent 

 the metamorphism of an average piece of Grenville limestone. 



