The Monteregian Hills. 201 



them, but a short distance to the south, Rougemont being 

 the nearest neighbor to Mount Johnson and Brome 

 mountain being immediately south of Shefford. It is 

 highly probable, in view of this distribution, that these 

 ancient volcanic mountains are, as is usual in such occur- 

 ences, arranged along some line or lines of weakness or 

 deep-seated fracture. The " pretty nearly straight line " 

 referred to by Logan on which the first six mountains of 

 the group are situated must be considered either as a 

 single line with a rather sharp curve in the middle, 

 or as made up of two shorter straight lines, each with 

 three mountains, which diverge from one another at an 

 angle of about 30°, Montarville being located at the point 

 of intersection. Mount Johnson and Brome mountain 

 might then be considered as situated on short subsidary 

 fractures. 



Brome and Shefford, however, which are the two largest 

 mountains of the series and which are only separated by a 

 distance of a little over two miles, are probably connected 

 at no great depth below the surface, forming in reality 

 one large mass, while Mount Johnson, like the similar 

 volcanic necks of Fife and Wlirtumberg, may have no 

 direct connection with any line of fracture. It must be 

 noted, as mentioned by Presser 1 , that while six of these 

 mountains rise from the horizontal strata of the plain, the 

 two most easterly members of the group, named Shefford 

 and Brome, while still to the west of the axis of the range, 

 lie well within the folded belt of the Appalachians, though 

 owing to the extensive denudation from which the region 

 has suffered, this folding has had but little influence on 

 the local topography. 



No collective name has hitherto been proposed for this 

 remarkable group of hills. 2 From their intimate geo- 



1 " On the Petrography of Shefford Mountain,"^rrtcr. Geol., October, 1901. 



2 The only instances in which these hills have been referred to as a geographical 

 unit are, so far as can be ascertained, in a paper by Sterry Hunt entitled " On Some 

 Igneous Rocks of Canada," Amer. Jour. Science. March, 1800, where they are called the 

 Montreal group ; and by Elie de Beaumont, who in a late edition of his Systemes de 



