30 



In certain places, especially about the border of the 

 Glamorgan batholith, where the line of contact is especially 

 well exposed for study, a gradual passage of the limestone 

 into amphibolite can actually be observed, the former rock 

 having gradually developed in it feldspars, hornblende and 

 pyroxene in progressively greater amount, until it event- 

 ually becomes an amphibolite. A detailed description of 

 this form of alteration, with a chemical and mineralogical 



Limestone passing into pyroxene gneiss and amphibolite cut by granite. Southern 

 border of Glamorgan batholith, Maxwell's Crossing. 



study of the transitional rocks, will be found in the report 

 on the geology of the Haliburton and Bancroft areas to 

 which reference has already been made. (See also pp. 

 63-73 of this Guide Book.) 



Evidences of alteration of the third class are less 

 frequent and less striking. Nevertheless, in certain cases 

 it appears to be practically certain that there has been a 

 distinct solution of the invaded rocks by the granite. This, 



