56 



absent. In the quantitative classification the rock is a 

 phlegrose. 



An analysis of the rock is given on page 96. 



This syenite passes imperceptibly into the nepheline 

 syenite on either side by an increase of soda feldspar. The 

 transition is also well seen on the southern end of lot 15 of 

 concession VIII of the Township of Monmouth at the 

 corners near Hotspur post office. The nepheline syenite 

 here has a schlieren structure caused by a variation in the 

 relative amount of constituent minerals in the different 

 streaks. Some of these schlieren consist of red syenite, 

 others are intermediate in composition between red syenite 

 and the nepheline syenite. There are thus represented in 

 these schlieren a complete transition from the red syenite 

 to the white or grey nepheline syenite. 



The nepheline syenite which forms the border of the 

 mass has a distinctly foliated structure and is coarse in 

 grain. It is white to dark grey in colour according to the 

 proportion of the ferromagnesian constituents which it 

 contains. It usually possesses a rudely banded or 

 schlieren structure which conforms in direction to the 

 foliation of the rock, which in its turn conforms to the 

 outline of the intrusion, that is to say, the foliation of the 

 nepheline syenite strikes around the mass as does also the 

 intruded limestone. 



In the nepheline syenite some of the schlieren are rich 

 in nepheline, while in adjacent schlieren nepheline is 

 present only in small amount. A similar variation is to 

 be observed in the case of the dark constituents of the rock. 

 The party will examine this occurrence along two of the 

 roads which cross it. 



Leaving Tory hill the road running in an easterly 

 direction will first be taken and followed for one mile. 

 Along this road the white crystalline limestones are first 

 seen in large exposures and are succeeded on lot 21 of 

 range XI of the Township of Monmouth by large exposures 

 of the nepheline syenite showing the usual schlieren 

 structure and foliation, which in most places is rich in 

 nepheline and coarse in grain. 



The party will then return to the train which will 

 proceed as far as McCue's crossing, and leaving the train 

 will walk south to the corners near Hotspur post office, 

 where they will take the road running in a westerly direction 



