6oo 



CLARENCE N. FENNER 



amount. As in the massive granite, some indications of strain 

 and deformation are apparent, but evidences of granulation to any 

 important degree are lacking. 



At the old quarry and at natural exposures in the neighborhood 

 the rock masses exhibit features similar to those which have been 

 described. Fig. 6 shows a portion of a glaciated surface adjacent 

 to the old workings. The bands appearing in the foreground are 



composed of very dark hornblende-bio tite gneiss, having a col- 

 lective width of 2-3 feet, which are exposed for a length of about 

 25 feet and are cut off at both ends by granite. At their termina- 

 tions the individual layers become considerably separated by an 

 increase in the width of the dividing bands of granite. This is a 

 feature which was noted in a number of instances. At each side 

 there are large masses of coarse granite in which traces of dark 

 minerals arranged in parallel lines are just visible. 



In the old quarry, where dark inclusions are fairly plentiful, the 

 quarry-faces, which are still perfectly fresh and clean, exhibit the 



