48 THE ROYAL SOCIETY OF CANADA 



Dr. F. D. Adams described an alnoite dyke at Ste. Anne de 

 Bellevue' and an alnoite-like dyke at St. Lin-, twenty-five miles 

 north of Montreal, both of which he considered Monteregian in 

 character. In 1901 Miss Nolan and Miss Dixon^ made a detailed 

 examination of the breccia on St. Helen's Island, and in 1909 Dr. 

 Robert Harvie re-examined the breccia localities mentioned by Logan, 

 together with some new occurrences*, and in 1921 Dr. N. L. Bowen 

 of the Carnegie Geophysical Laboratory published a paper on the 

 alnoitic intrusion at Isle Cadieux, twenty-seven miles west of Mont- 

 real.^ 



There is a tendency on the part of some American geologists to 

 place some of the alkaline intrusives of the New England States in 

 the Monteregian Petrographical Province, notably, Red Hill, Mt. 

 Ascutney, and Mt. Monadnock. It does not lie within the province 

 of this paper to discuss this relationship further. 



General Statement 



During the summer of 1921 the writer visited the occurrences at 

 Isle Cadieux (described by Bowen) and La Trappe (described by 

 Harvie) and also investigated some new localities, namely, Como, Ste. 

 Monique, and Ste. Dorothée. The information obtained is incorpo- 

 rated in this paper, and the location of these outliers together with 

 that of the other members of the province is shown on Figure 1. 



The writer desires to acknowledge the valuable suggestions and 

 assistance rendered in the preparation of this paper by Dr. H. S. 

 Washington of the Carnegie Geophysical Laboratory, Dr. Robert 

 Harvie of the Canadian Geological Survey, and Dr. F. D. Adams, 

 Dr. J. J. O'Neill, Dr. H. C. Cooke, and Prof. R. P. D. Graham, all 

 of McGill University, as well as the above-mentioned papers, and 

 many others, and he has endeavoured in each case to give due acknow- 

 ledgment. 



The positions of the various members of the Monteregian Petro- 

 graphical Province on the map accompanying this paper are taken 

 from Guide Book No. 3, for the 13th International Geological Con- 

 gress, issued by the Canadian Geological Survey in 1913, with the addi- 

 tion of the areas described on page 51 as well as several dykes including 



lA. J. Sci. 3rd Series, Vol. XLIII, pp. 269-279, 1892. 



2G.S.C. Ann. Kept., Vol. VIII, Pt. J, p. 136, 1895. 



'Can. Rec. Sci. Vol. IV, No. 1, 1903. 



^Trans. 4, Roy. Soc. of Can. 3rd Series, Vol. Ill, Sec. IV, pp. 252-299, 1909. 



»A. J. Sci. 5th Series, Vol. Ill, pp. 1-34, Jan., 1922. 



