4 RO^AL SOCIETY OF CANADA 



A brief description of this area of nepheline syenite was given in 

 a paper which appeared in 1894, and analyses by Dr. B. J, Harrington 

 of the sodalite and certain other minerals occurring in the nepheline 

 syenite were published at the same time.' 



The discovery of corundum in the associated alkali syenite on lot 

 14, con. XIV of the township of Carlow was made by Mr. W. F. Ferrier, 

 of the Geological Survey of Canada in 1896,^ and the possibilities of the 

 exploitation of the corundum-bearing varieties of these syenites was 

 subsequently studied by Dr. Barlow^ of the Geological Survey and by 

 Dr. Miller* of the Ontario Bureau of Mines. As a result of these in- 

 vestigations corundum is now being mined on a large scale in the nephe- 

 line and alkali syenites at Craigmont. The sodalite at the original 

 locality, which is a short distance to the east of the town of Bancroft, 

 ia also extensively worked as an ornamental stone. 



Following the geological reconnaissance to which reference has been 

 made, a detailed geological survey of this whole area was undertaken 

 for the Geological Survey of Canada by the writers, which led to the 

 discovery of a large number of additional areas of nepheline syenite, 

 many of them carrying corundum, as well as to' an extended study of the 

 relations of these rocks toi the other rocks of the Protaxis, in which they 

 occur. The results of this study will appear in the form of a Report 

 to the Geological Survey of Canada, which is now about to go to press 

 and which is accompanied by two geological maps of the area in ques- 

 tion. In the present paper it is proposed to present merely the chief 

 results obtained from the study of the nepheline syenites and the rocks 

 immediately associated with them, the reader being referred to the re- 

 port in question for additional local details if required. 



Distribution. 



All the occurrences of nepheline syenite in this region, with the 

 exception of those in tlie township of Methuen, are found in a com- 

 paratively narrow belt of country which has a general north-easterly 



' Adams, F. D. — On the occurrence of a lar&e area of Nepheline Syenite 

 In the township of Dung'annon, Ont. — Amer. Jour, of Science, vol. xlviii, 

 July 1894. 



Harrington, B. J. — On Nepheline, Sodalite and Orthoclase from the Nephe- 

 li«ne Syenite of Dungannon, Hastings County, Ont. — ditto. 



'Ann. R<>p. Geol. Surv. Can. Vol. ix. 1896 p. 116. A. 



•Summary Reports. Geol. Surv. Can. 1896, p. 53; 1897 pp. 48-56; 1898 p. 

 110; 1899 pp. 130-131; 1900 pp. 127-128; 1901 p. 148; 1903 pp. 142-143; 1904 

 pp. 190-193. 



*Ann. Rep. Bur. of Mines Ont., Vol. vii. Part III, 1898 pp. 207-238; 

 Ann. Rep. Bur. of Mines Ont., Vol. viii. Part II, 1899. pp. 205-240. 



Amer. Geol. Nov. 1899 Vol. xxiv., pp. 276-282; Jour. Can. Min. Mat. Vol. 

 v. 1902 pp. 233-255. 



