Plate A 



Photomicrograph of specimen no. IOO-&. A shear-zone schist. Taken with 

 plain light, magnification alDout 30 diameters. A specimen of Grenville epidote 

 schist from a shear zone. 



Taken to show the fine structure of this rock with the minor crumpling 

 and augen or mortar structure characterizing this material. The composition 

 is chiefly epidote and quartz. 



Plate 



Photomicrograph of no. loo-b-x. Same as 100-&. With crossed nicols, 

 magnification about 30 diameters. 



Taken particularly to show the detail of minor structure within the quartz 

 bands of the same specimen loo-b. 



This is vein quartz probably derived from the invasion granites, and the 

 epidote and other constituents are products of anamorphism under the same 

 influences. These points suggest deformation of about Canada Hill age. 



