246 FRANK D. ADAMS 



Harrington/ Lacroix/ and the present writer, ^ respectively, all 

 dealing with Mount Royal. In 1896 the "Montreal Sheet" of 

 the Eastern Townships Map, prepared by Ells, and embracing the 

 district of the Monteregian hills, was published by the Geologi- 

 cal Survey of Canada and accompanied by a geological report 

 on this portion of the province of Quebec. Four years later 

 Principal Dresser of St. Francis College, Richmond, aided by a 

 small grant from the Geological Survey of Canada, made a care- 

 ful study of Shefford mountain, and a preliminary paper embody- 

 ing the chief results of his investigations appeared in 1901.'^ Mr. 

 Dresser last summer extended his work to Brome mountain, and 

 has since published a brief description of this occurrence. ^ Mr. 

 O. E. Leroy, of McGill University, is now engaged in a study of 

 Beloeil, and I am indebted to him for the facts concerning the 

 geology of this mountain which are here presented. Montar- 

 ville, Rougemont, and Yamaska mountains still await detailed 

 study, but it is expected that they also will before long be put 

 in commission. 



In the present paper it is proposed first to gather together 

 the more important facts concerning the geology of the Mon- 

 teregian hills which are scattered throughout these various pub- 

 lications, revising some of the earlier work and embodying the 

 results of later personal studies, and then to describe in some 

 detail one of these hills — Mount Johnson — of which hitherto 

 but little has been known. 



PETROGRAPHY OF THE MONTEREGIAN HILLS. 



Hunt distinguished four types of igneous rocks as constitu- 

 ents of the Monteregian hills. These he classed as trachyte, 



^ " On Some of the Diorites of Montreal," Antt. Rept. of the Geol. Surv. of Can- 

 ada, 1877-78, 42 G. 



^ " Description des syenites neplielinitiques de Pousac et de Montreal (Canada) 

 et de leurs phenomenes de contact," Bull. Soc. Geol. de France, 3* serie, tome XVIII, 

 1890. 



3 " On a Melilite-Bearing Rock (Alnoite) from St. Anne de Believue near Montreal, 

 Canada," ^Wi?;-. ybz^r. of Science, April, 1892. 



" " On the Petrography of Shefford Mountain," Amer. Geol., October, 1901. 

 5 Summary Report of the Geological Survey Department for igoi, p. 183. 



