434 THE CANADIAN NATURALIST. [Vol. 



VII. 



third o^roup of lines, lighter and more irregular than the last, 

 und still more obviously .iffjcted by the contour of the surfaces 

 over which they are spread. Such variations might naturally 

 be looked for as likely to result from progressive diminution in 

 the thickness of the ice cap, as the maximum of density and 

 volume gradually receded to the North. 



As an instance of these variations, the striae under No. 39 of the 

 following table may be cited. This ledge has been uncovered in 

 taking gravel for road-making, and the glacial markings are fresh 

 and sharply cut. The oldest record on the ledge shows that the 

 ice once moved directly, through Beaver Harbour, in a course 

 nearly due South, scoring horizontally the slopes of the ridges by 

 which it is bounded on either side. This southerly direction is 

 that of the striae on the highest ridges in the Southern counties. 

 The course of the next set of lines shews a tendency in the ice to 

 slide obliquely downward into the harbor ; and finally it appears 

 to have moved directly down off the hill into the basin in front. 

 The bearings on this ledge exhibit a change in the course of the 

 moving ice, from first to last, of fully a quarter of a circle. Similar 

 influences may be traced in the striag of Bocabec Bay, and in the 

 converging lines which enter the upper basin of L'Etang River. 



Perhaps the most remarkable locality for these markings is 

 one observed by Prof. L. W. Bailey, last summer, on the west side 

 of Chamcook Mountain, near Saint Andrews (No. 12). This 

 eminence (637 feet high) has on its western side a buttress or 

 lower hill, which overlooks the Sainte Croix valley. The rock 

 is steep and high, and toward its base there is a deep recess cut 

 in the face of the cliff, and extending for some distance along 

 its foot. The ledge which covers the recess overhangs about 

 sixty degrees! and upon its under-surface are strong, regular, 

 and distinct strise, parallel to the direction of the cliff. Below 

 this overhanging rock there is a talus of loose blocks of felsite, 

 extending to the base of the hill — about seventy feet lower — 

 where the ground becomes nearly flat, and descends gradually to 

 the Sainte Croix River. For a space of four miles to the west, 

 and an indefinite distance to the south, there are no elevations 

 or ridges which could have brought pressure upon the under- 

 6urface of this overhanging rock to groove it ; and it was protected 

 from the assaults of icebergs by an extension of the Chamcook 

 range of hills for three miles to the north-west. Here, therefore, 

 if anywhere, the glacier has left a witness of its former presence 

 in New Brunswick. 



