558 



W. C. PHALEN 



lected showing varying stages in the transition from the unfractured 

 massive vein quartz to those in which the quartz pebbles were fairly 

 well developed. Such specimens though less perfect examples of 

 the structure itself are nevertheless instructive in that they show the 



■^^viv-g^ 



Fig. 3 



Fig. 2. — Group of quartz lenses. Lenses numbered i, 2, and 3 have been 

 separated from 4 and may be replaced in their former positions. 



Fig. 3. — A bundle of imperfect lenses. The arrow indicates a lens about to 

 break off. 



intermediate steps in the transition of the massive rock to the len- 

 ticular or stretched pebble-like phase, and one method by which the 

 latter may be formed. 



OTHER OCCURRENCES 



On the road which leads directly north from Ellijay up Ellijay 

 River there is another occurrence of the structure (for such it may be 

 regarded) described near Ellijay depot, about a mile and a quarter 

 north of the town and about a quarter of a mile south of the road forks. 



