182 THE ICE AGE IN CANADA. 



These shells imply a higher beach than that of this 

 lower flat, which is not more than thirty feet above the 

 present sea level. Accordingly, above this are several 

 higher terraces. (See Supra under " Terraces and Kaised 

 Beaches.") The second principal terrace, which forms a 

 steep bank of clay some distance behind the main road, is 

 116 feet in height, and is of considerable breadth, and has 

 on its front in some places an imperfect terrace at the 

 height of 81 feet. It corresponds nearly in height with 

 the shoulder over which the road from the pier passes. 

 Upon it, in the rear of the property of Mr. Duberger, is 

 a little stream which disappears underground, probably in 

 a fissure of the underlying limestone, and returns to the 

 surface only on the shore of the bay. Above this is a 

 smaller and less distinct terrace, 139 feet high. Beyond 

 this the ground rises in a steep slope, which in many 

 places consists of calcareous beds, worn and abraded by 

 the waves, but showing no distinct terrace ; and the 

 highest distinct shore mark which I observed is a narrow 

 beach of rounded pebbles at the height of more than 300 

 feet ; but above this there is a flat at the height of 448 

 feet. This beach appears to become a wide terrace further 

 to the north, and also on the opposite side of the bay. 

 It probably corresponds with the highest terrace observed 

 by Sir W. E. Logan at bay St. Paul, and estimated by 

 him at the height of 360 feet. 



As already stated, three of the principal terraces at 

 Murray bay correspond nearly with three of the principal 

 shore levels at Montreal ; and in various parts of Canada 

 two principal lines of old sea beaches occur at about 100 

 to 150 feet, and 300 to 350 feet above the sea, though 

 there are others at different levels. 



