10 



to be able to place additional evidence on this interesting sub- 

 ject before the Society. 



The beach on the east side of the Point is thickly strewn 

 with erratics, which are of large size and in considerable 

 variety. It is remarkable that at the extreme point 

 of the headland, where the schists form reefs running 

 in the direction of West Island, there are no erratics on the 

 coast : but within the bays on either side of King's Point ice- 

 transported stones are extremely common. The barren ground 

 next the island has been sea-swept, and a thickness of 30 ft. 

 of schist removed by wave action, which has also disposed of 

 the morainic material which capped these schists. The source 

 of the erratics in the bays on either side of the Point can be 

 readily traced to the glacial clay which comes down to the 

 beach in immediate proximity to these boulders. 



The rounded hummock of schist, which has been cut into 

 by the sea at the extreme point, and passes out of sight 

 under the moraine on the landward side, probably received 

 its rounded form under ice movement ; but no evidence of a 

 polished pavement could be detected on its surface. When 

 we consider the soft and friable nature of the mica-schist 

 which formed the floor of the glacier this absence of the 

 evidences of glaciation cannot be wandered at. A stone of 

 this kind could neither take a fine polish in the first instance 

 nor retain it against the weathering action of subsequent ages. 

 Clear evidence of glaciation was, however, obtained from the 

 erratics, as already stated. 



Conclusion. 



Both the moraines described in this paper illustrate the 

 important effects produced by hard prominences in conjunc- 

 tion with soft rocks in promoting morainic aggradation. 

 The increasing ice- sheet became in time an "ice-flood" with 

 high erosive energy directed towards deepening its bed and 

 transporting its debris. On meeting the hard granitic barrier 

 that ran east and west its quarrying power was checked ; but 

 passing over this strongly - resisting rock, it immediately 

 plunged into the yielding schists and excavated its path in 

 them below the normal level. When the ice age was passing 

 away and the ice-sheet shrinking back to the greater eleva- 

 tions the power to erode was lost, the rock basins gradually 

 becoming choked by the material which the glacier had no 

 longer power to scoop out from the deeper levels. This was 

 the age of aggradation, a levelling-up of the uneven floor of 

 the glacier bv the load it was no longer able to carry to the 

 regions bevond. 



