[ADAMS A BARLOW] ALKALI SYENITES OF EASTERN ONTARIO S 



course, as shown on the accompanying map. The most westerly occurr- 

 ence discovered is that in the township of Lutterworth, where a 

 corundum-bearing syenite has been found on lot 12, concession IV. of 

 this township. The next occurrences are those which are situated in 

 the townships of Glamorgan and Monmouth, in which townships some 

 twenty separate areas of the rock have been mapped and studied. The 

 largest and in many respects the most noteworthy of these is a ^vide belt 

 of nepheline syenite which surrounds an occurrence of granite inter- 

 vening between this rock and the limestone which forms the country 

 rock of the central portion of the township of Monmouth. Here the 

 nepheline syenite and the granite are clearly seen to be differentiation 

 products of a common magma. The other occurrences in these townships 

 are smaller and lie for the most part in the limestone. 



Going toi the east from the township of Monmouth a narrow band 

 of nepheline syenite can be traced across the corner of the township of 

 Cardiff into the second range of Harcourt, beyond which, in the north- 

 east corner of Cardiff, occurrences of the closely related white alkali 

 syenite have been noted by Dr. Miller at Leafield. 



Beyond this, in the north-west corner of the township of Faraday, 

 what appears to be a continuous belt of nepheline syenite, accompanied 

 sometimes by the closely related red alkali syenite, extends in a south- 

 easterly direction for a distance of about three and a half miles, cross- 

 ing the Monck road on lot 26 between concessions A and B. Near this 

 place there is a gradual change in the strike of the rock, the band curv- 

 ing around and running in a direction a little north of east, as far as lot 

 16 of concession A. It is impossible to trace its further extension east- 

 ward, as occasional outcrops only were found protruded through the 

 deep covering of drift. It seems, however, entirely reasonable to as- 

 sume that the several exposures found, belong to one continuous belt, 

 for as the village of Bancroft is approached there is a very marked in- 

 crease in the area over which these syenite rocks are distributed. At 

 its intersection with the Hastings road at the village of Bancroft, be- 

 tween the townships of Dungannon and Faraday, the nepheline syenite 

 measures over half a mile across its strike, which is here nearly east 

 and west. East of Bancroft tliese syenite rocks increase very rapidly 

 in volume, attaining their maximum development in the vicinity of 

 Bronson, where extended and often nearly continuous outcrops may be 

 found for a distance of over two and a half miles in a north and south 

 direction, underlying most of the area between the eleventh and four- 

 teenth concessions as far as the York river. 



Along the valley of the York river and extending in a general 

 direction a little east of north from the bridsre over the York river in 



