Further Exploration of Centre Valley 



product of running water. Others again were arranged 

 in mounds of irregular form and were more angular in 

 character, suggesting moraines similar to the one near 

 the mouth of Gold Creek. They were, however, smaller 

 both as regards the height of the mounds and the 

 breadth of country which they covered. 



All these deposits appeared to have been formed 

 during the retreat of the ice towards the head of the 

 valley, the moraines marking the halting-places at which 

 the ice-front had stood for some time, and the inter- 

 vening spreads of water-worn gravel, the spaces over 

 which the retreat had been rapid. 



Here and there rounded bosses of rock protruded 

 from the gravels, and these were found, upon examination, 

 to be much more rounded on their upstream sides than 

 on the downstream, which were often broken and 

 craggy, the sides being smooth and striated. These 

 were typical roches moutonne'es, such as abound in all 

 recently glaciated countries. So marked was the degree 

 of rounding on the upstream ends of these bosses in one 

 section of the valley, that the type of scenery was quite 

 different, according as one happened to be looking up- 

 stream or down. Looking up the valley only the rough 

 craggy ends of the roches moutonne'es could be seen, and 

 the scenery was, in consequence, wild and irregular, while, 

 on turning oneself about, the rounded flowing outlines 

 of the smooth surfaces took the place of the rough 

 crags. 



In the bare smooth surfaces of the roches moutonne'es 



which consisted chiefly of gneiss we were able to trace 



numerous dykes of basalt and also of another type of 



igneous rock known as quartz-porphyry. This latter is 



R 257 



