Miles and 
kilometres. 
10-3 m. 
16-6 km. 
12-8 m. 
20-4 km. 
18 
syenite, is seen on the left. On its steep slopes 
are wave-cut terraces, with fossiliferous marine 
clays and other evidences of the submergence of 
this portion of the country in post-Glacial times. 
About Mile End are large quarries from which 
stone for building purposes and for the pro- 
duction of lime is obtained. The grey limestone 
of which Montreal is largely built, is obtained 
chiefly from these quarries. 
These Trenton limestones are highly fossil- 
iferous; over 80 specimens of marine inverte- 
brata have been described from them, including 
Lingula quadrata, Plectambonites Sericeme Cteno- 
donta nasuta, etc. 
The plain traversed by the railway is a 
portion of the great plain of the St. Lawrence 
lowlands, which stretches away to the north 
as far as the margin of the Canadian Shield, 
which here is 30 miles distant. The Ordovician 
rocks of the plain are covered by deposits of 
Pleistocene age, consisting of boulder clay over- 
lain by the Leda clay and Saxicava sand, both 
of which are in many localities filled with marine 
shells. The plain, which is very fertile and 
supports a large farming population, gradually 
rises to the north and at the margin of the Cana- 
dian Shield has an elevation of about 300 feet. 
(91-4 m.). | 
Three quarters of a mile beyond Mile End 
the Trenton is succeeded by the conformably 
underlying limestones of the Chazy. 
Bordeaux—Alt. 75 ft. (22-8 m.) Here the 
train crosses the Back river, or Riviére—des— 
Prairies, a branch of the Ottawa river which flows 
around the north side of the Island of Montreal 
and enters the St. Lawrence a few miles farther 
to the east. 
The river here runs very rapidly, forming the 
Sault-au-Recollet, called after Nicholas Veil, a 
Recollet priest who was drowned here by the 
Huron Indians in 1626. 
Parc Laval. 
St. Martin’s Junction—Alt 110 ft. (30°8 
m.). The line for Quebec leaves here. 
