SUPERFICIAL GEOLOGY OF BRITISH COLUMBIA. 



93 



and width, and show in all respects traces of having been subjected 

 to the action of a great glacier. Where rocky hills are remarkably 

 abrupt, their northern slopes only have received the full force of the 



Fig. 1. — Ice- grooved Roclcs at Finlayson Point, Victoria, Vancouver 



Island. 



ice, which, borne up to some extent by their summits, has marked 

 the southern slopes slightly and irregularly. A comparatively slight 

 decrease in steepness of descent has, however, been sufficient in 

 other cases, to enable the ice-mass to follow the contour of the rock, 

 impressing the southern slopes with grooving almost as well marked 

 as that of the northern. This is generally the case with the rocks 

 forming the southern shore of the peninsula, where the furrows may 

 be traced running regularly down beneath the sea. Here there is evi- 

 dence of great lateral as well as downward pressure, vertical and nearly 

 vertical surfaces being frequently as well polished as horizontal ones. 

 Instances where rocks have actually been fluted and undercut at the 

 sides are not uncommon (fig. 2). Another circumstance noticed in 

 many places, dependent, no doubt, on combined vertical and great 

 lateral pressure, and consequent " plasticity " of the ice, is the manner 



