17G THE ICK AOK IX CANADA. 



practicable with care to a carriage, the u;eiieral (Urectioii 

 beinj^ nearly iioi-th and soiitli. What its extent or conrso 

 may be beyond the points where tlie road enters on and 

 leaves it, I do not know ; but it appears to extend from tlie 

 base of tlie Cobecinid mountains to a ridge of sandstone that 

 crosses the lower part of the Ileliert river. It consists of 

 gravel and sand, whether stratified or not I could not 

 ascertain, witli a few large boulders. Another very singu- 

 lar ridge of tiiis kind is that running along the west side 

 of C.'lyde river in Slielbuiiie countv. 'I'his rid<je is higiu'r 

 than tiiat on Hebert river, but, like it, extends parallel lo 

 the river, and forms a natural road, improved l)y art in 

 such a manner as to l»e a \ery toleral)le highway. Along 

 a great part of its course it is separated from the river by 

 a low alluvial Hat, and on the land side a swamp intervenes 

 between it ami the higher ground, shorter and moii; 

 interru])ted ridges of this kind ma}' also l)e seen in tlu; 

 country northward and easlwai'd of the town of I'ictou. 

 In sections thev are seen to be stratified, and thev 

 generally occur on low t)r level tracts, and in places where, 

 if the country were submerged, the surf or marine currents 

 and tides might be expected to tlirow uj) ridges. The 

 presence of boulders shows that ice grounded on these 

 ridges, and it, probaV)ly by its prc-sure, in some instances, 

 modified their forms. These eskers, or " Imrse-backs," 

 must not, however, be regardi'd as glacier moraines, to 

 which in structure they generally bi'ar no resembliince. 



Mr. Chalmers has in Xew JJrunswick endeavoured, with 

 some success, to distinguisli those that belong to river 

 valleys and glaciei's from those that are marine. 



The liev. Mr. Paisley has published in the Canadian 

 Nafnralist (187^) a list of shells ol)tained from a railway 

 cutting on the Tattagouche river, near Uatlr.irst, in New 



