Pleistocene of Montreal and the Ottawa Valley. 193 



At St. Anns, at the head of the Island of Montreal, the 

 shore rises steeply from the water. The limestone 

 extends to the surface, and at the Station has been 

 removed to form the bed of the Railway, showing the 

 even and regular stratification ; while for a considerable 

 depth from the surface it is decomposed and turned into 

 soil containing small rounded boulders of decomposition 

 near the Station. Among other debris being removed by 

 laborers, was a large block of conglomerate apparently 

 identical with that on St. Helen's Island belonging to 

 the Helderburg system. 



Crossing the Iliver by the fine steel bridge, we note the 

 presence of a number of low, fiat islands in the lake, 

 indicating shallow water outside of the channel marked 

 by a line of buoys. 



Crossing Isle Perrot, which is alternately low, and 

 swampy, and hilly, with small boulders, an outcrop of red 

 sandstone belonging to the Potsdam formation mav be 

 observed ; another of the same being found near Hudson. 

 Passing over the branch of the Ottawa separating the 

 Island from the mainland, which is shallow with swift 

 currents, we reach Vaudreuil, situated on a fiat alluvial 

 plain marked to the South by a high well-defined bench, 

 at some time the shore of the then lake. 



Approaching Como the plain becomes broken and 

 irregular with gravelly hills covered in places with 

 boulders, and at Hudson Heights the Ptailway runs close 

 to the water's edge with a bank of sand and gravel rising 

 steeply on the south side of the line to the height of 

 apparently over a hundred feet. 



Directly across the lake which seems to be about two 

 miles in width, there rises the mass of Mont Calvaire; 

 while the shore on the North is seen to be a great bank 

 similar to that on the South, stretching along the lake for 

 a distance difficult to estimate, but apparently about 

 the same height as the southern bank with the straight, 



