SEcnoN IV., 190S. [3] Trans. R. S. C. 



I. — The Nepheline and Associated Alkali Syenites of Eastern Ontario, 



By Frank D. Adams, D.Sc, F.K.S, and Alfred E. Barlow, M.A., D.Sc. 

 (Published by permission of the Director of the Geological Survey.) 



(Read May 26, 1908.) 



1. Introduction. 



2. Distribution, 



3. Geological Relations. 



4. General Petrographical Character. 



5. Mineralogical Composition. 



6. Description of the several occurrences: 



(a) The Alkf-.li Syenites of the Township of Lutterworth. 



(b) The Nepheline and Alkali Syenites of the Township of 

 Monmouth. 



(c) The Nepheline and Alkali Syenites of the Township of 

 Glamorgan. 



(d) The Nepheline and Alkali Syenites of the Townships of 

 Harcourt, Cardiff and Wollaston. 



(e) The Nepheline and Alkali Syenites of the Township of 

 Methuen. 



(f) The Nepheline and Alkali Syenites of the Townships of 

 Faraday, Dungannon, Carlow and Monteagle. 



7. Summary. 



Introduction. 



By far the most extensive development of nepheline syenite which 

 has up to the present time been discovered in North America, or in fact, 

 BO fax as can be ascertained, anywhere in the world, is that which occurs 

 in the eastern part of the Province of Ontario, in the counties of Hali- 

 burton, Peterborough, Hastings and Renfrew, in the tract of country 

 whose position is indicated on the accompanying sketch map. 



The occurrence of nepheline syenite in tMs district was first re- 

 cognized in 1893, attention having been directed to its probable existence 

 by a specimen of sodalite which was sent in to the Museum of the Geo- 

 logical Survey at Ottawa from the township of Dungannon in the spring 

 of this year, just as Dr. Adams was about to leave for that district to 

 undertake a geological reconnaissance of this part of Eastern Ontario for 

 the Geological Survey of Canada. 



On visiting the locality from which this socialite came, the mineral 

 was found to occur in the form of veins traversing a large area of nephe- 

 line syenite m the ancient crystalline rocks of the Laurentian Protaxis. 



