51 
Beyond the Monteregian Hills in the far east some of 
the higher points of the Notre Dame mountains, which 
in Canada represent the Appalachian Mountain folding, 
are visible, while to the southeast on the horizon are 
the Adirondack mountains in the State of New York. 
These latter are of Laurentian age, forming a great out- 
lying island of the Canadian Shield, completely sur- 
rounded by sediments of Paleozoic age. About 100 yards 
west of the Outlook are the exposures of essexite described 
on p. 37. 
Proceeding northward from the Lookout another 
exposure of essexite traversed by many dykes is seen in 
a fine cliff by the roadside, in which, however the rock is 
considerably decomposed. This decomposition is seen in 
a still more striking manner in exposures occurring at the 
back of the Protestant cemetery, where the rock has crum- 
bled into a deep brown residual soil. Near this point the 
highest post-glacial beach deposit (568 feet above sea level) 
on Mount Royal is found. 
Continuing across the mountain, through the Roman 
Catholic cemetery, the fresh essexite, often very basic in 
character, is again exposed. In this cemetery the first 
evidence of the existence of a second great intrusive mass 
in Mount Royal—the nepheline syenite—is seen. 
This rock occurs here in the form of dykes, light in 
colour, which cut the dark essexite and often enclose 
angular fragments of it. 
Passing down the steep northerly slope of Mount 
Royal, a fine view across the plain to the north is obtained, 
with the highlands of the Laurentian Protaxis (Canadian 
Shield) bounding the horizon. At the foot of this 
slope is the Corporation (Forsyth’s) Quarry. 
This quarry was worked for many years, the nepheline 
syenite obtained from it being used as road metal in the 
city of Montreal. This rock is seen to be intruded between 
the essexite of the mountain and the Trenton limestone 
which here underlies the plain. It cuts through both rocks, 
sending apophyses into the essexite of which it also holds 
many inclusions and metamorphosing the blue fossiliferous 
Paleozoic limestone into a very coarse grained white 
marble. 
A great swarm of dykes, representing the latest phase 
of the igneous activity, in their turn traverse the whole 
complex. 
32224—43 
