

206 HOLLAND: SIVAMALAI SERIES. 



but having heard privately of the discovery, I postponed this discussion 

 of the relations between the corundiferous rock and the elaeolite- 

 syenite until the Canadian occurrence had been fully described. 

 Following Dr. A. P.Coleman's discovery in 1890 of elaeolite-syenite 

 amongst the boulders of the drift in Central Ontario, 1 Prof. F. D. 

 Adams in 1893 discovered a large area of the same kind of rock in 

 the county of Hastings, Eastern Ontario. 2 Corundum was found 

 in this region by Mr. W. F. Ferrier in 1896, 8 and in the following 

 year Prof. W. G. Miller's examination of the ground revealed the fact 

 that the mineral occurred in association with the elaeolite-syenite.* 

 Other occurrences of the same rock series were examined by 

 Dr. A. P. Coleman in 1 898.5 



Like the elaeolite-syenites of Sivamalai, those of Ontario are 

 included with the gneissic rocks classified usually as Laurentian, 6 

 being foliated in conformity with the gneisses around and traversed, 

 as in the case at Sivamalai, by coarse-grained contemporaneous 

 veins. 



Comparison of the descriptions herein given with those by the 

 Canadian geologists will show that, besides certain resemblances in 

 the characters of the two occurrences of elaeolite-syenites and corun- 

 diferous rocks, there are important differences. The most important 

 of these is the occurrence of corundum in the elaeolite-syenite, as 

 well as in the associated syenite, of Ontario, whilst at Sivamalai, 

 so far as we know, the corundum never actually occurs in theelaeolite- 

 bearing rock. Prof. Miller has remarked, however, that in Ontario 



1 Coleman : Trans. Roy.Soc. Canada, VIII (1890), Sect. Ill, p. 14. 



2 Adams : Amer. Journ. Sci. (3), XLVIII (1894), 10. 



3 Ann. Report of the Geol. Surv. Canada for 1896, IX, p. 116A. 



4 Miller: Report of the Bureau of Mines, Ontario, VII, part 3, p. 207, and 

 further occurrences in 1898. (Ibid, Vol. VIII, part 2, p. 205.) 



5 Coleman : Journal of Geology, VII (1899), 437, ana Report of the Bureau 

 of Mines, Ontario, VIII, part 2, p. 250. 



6 See Adams and Barlow in Summary Report, Geol. Surv. of Canada for 1897, 

 pp. 47A, 48A and 52A. 



( 38 ) 



