Section IV., 1909 [249] Trans. R. ti. C. 



XV. — On the origin and relations of the Palaeazoic Breccia of the vicinity 



of Montreal. 



By Robert Harvie, B.A., M.Sc. 



(Read May 26, 1909.) 



OUTLINE. 



Introduction. 

 lieferences to previous work on the breccia. 



General Geology of the District, 



Eeniarks on the Physiography. 

 Geology, — Pleistocene. 



Palaeozoic sediments. 



Pre-Cambrian. 



Monteregian intrusives, general description. 



character of the rocks, 

 succession of types, 

 associated dyke rocks. 

 breccia. 



Detailed Description or the Various Occurrences of Breccia. 



La Trappe. Near Ste. Anne de 'Bellevue. 



He Bizard, S.W. He Bizard, N.W. 



White Horse Rapids. Westmount. 



Medical Building, McGill University.Ste. Helen's Island and He Ronde. 

 St. Paul Street, Montreal. Côte St. Paul. 



Montarville. 



Correlation of the Cements. 



Summary of Results. 



Introduction. 



A feature of the geology of the vicinity of Montreal and one noted 

 early in the history of the geological exploration of the district, is the 

 occurrence in several places of a remarkable breccia conglomerate. The 

 occurrences are in isolated patches confined to a certain limited belt, and 

 nothing else at all similar is known within a considerable distance. The 

 peculiar local restriction of these breccias together with the fact that 

 they enclose fragments of fossiliferous limestones much younger than 



