The Lake Fault Oil Gold 



mined and recorded upon the rough map which we 

 were preparing as we went along. 



Ahead of us as we once more sailed up the river, we 

 could now see a range of lofty mountains on the summits 

 of some of which snow still clung, though it was now 

 the end of May. 



As the edge of the plain was approached, we again 

 crossed an outcrop of the Lower Jurassic, and finally 

 entered upon a belt of Triassic Marls dipping in this 

 instance towards the south. The Triassic and Jurassic 

 rocks, therefore, formed a syncline with minor undula- 

 tions within it. 



The Trias outcrop was much obscured by great 

 spreads of sand which had been brought down by the 

 river from the valley above. An examination of the 

 sand showed it to consist chiefly of quartz grains, 

 angular in character and similar to those derived from 

 the waste of a granite or similar rock, with a few frag- 

 ments of felspar and a little magnetite and mica. 



Entering the mouth of the valley, we found our 

 further passage barred by rapids, and had, therefore, to 

 resign ourselves for the future to the slower progress of 

 canoes ; luckily the ground on both sides of the river was 

 fairly open, so that we were not unduly hampered by 

 trees or undergrowth in the portages, which we had to 

 make from time to time. 



We now set about the establishment of our base 

 camp, and, this being completed and the canoes pro- 

 visioned, we started on what would probably be the final 

 stage of our journey. 



The slower mode of progression imposed upon us by 

 the use of canoes in place of the launch was not without 

 o 209 



