328 po s t e I sia 



weight and in percolating waters operating in a 

 wide area and through great depths uniform 

 material will produce uniform results. Hence 

 the evenly assorted particles of quartz, clay, 

 carbonaceous material and other incidental 

 mineral components produce a rock evenly de- 

 formed, made crystalline and uniformly com- 

 pacted into a siliceous shale which, for hundreds 

 of feet in thickness, is a normal schist of perfect 

 crystalline texture. This is due to the pro- 

 cesses of mineral reconstruction reinforced by 

 mineral solutions brought in by percolating sub- 

 terranean waters. 



Willi tlie ([uartz schists of Providence Cove 

 comj)are the rocks in front of the Station and 

 indeed generally along the shore for the distance 

 of a mile. At the Station only thin layers of 

 the schistose type are to be seen. Laminae of 

 alternating hard siliceous bands and argillaceous- 

 carbonaceous material of a softer habit prevail. 

 This alternation gives evidence that there had 

 once been a succession of sand layers and muddy 

 shoreline flats succeeding each other many times. 



Again the geologist stands at Port Renfrew 



