64 BULLETIN OF THE NATURAL HISTORY SOCIETY. 



This is a peripheral phase of an orthoclase granite. It would 

 be an interesting point if the Devonian granites should prove to 

 be prevailingly orthoclase granites, as the post-Laurentian ones 

 at St. John are certainly dioritic granites [called syenite and 

 granite in Reports of the Geological Survey of Canada]. 

 72-15. i^e/si<e ^ Between the granite quarry and Van wart's. 



Fine grained, rather basic igneous rock, with lath-shaped 

 feldspais, partly plagioclase ; a few phenocrysts, light and dark, 

 but entirely altered so that they are not recognizable. A little 

 quartz in the groundmass. 



This may possibly be a dyke or extreme peripheral phase of 

 the granite, but I could not say on the evidence. It appears 

 originally to have been a fine-grained trachytic rock, with a good 

 deal of plagioclase. I expect that a good deal of information as 

 to their origin may be had from some of those unexamined crys- 

 talline rocks at the borders of the Devonian granites. They 

 should present a class of contact phenomena considerably different 

 from those of the post-Laurentian granites. 



