Geology 



We now ascended to the summit of the larger cone, 

 and succeeded in this case also in reaching the bottom 

 of the crater. We noted that in several parts of this 

 crater, and also in some fissures on the west side of 

 the cone, there were deposits of sulphur of sufficient 

 importance to serve as a source supply of that com- 

 modity. 



Having returned to our old camping-ground at 

 Three Forks, we set about the arrangement of our 

 stores and the fitting out of packs of provisions for a 

 more extended journey into the mountains than any of 

 the previous ones. Before leaving on the main expedi- 

 tion we pegged out certain areas of the gold-bearing 

 gravels, as being most likely to yield richly, so that the 

 men of the expedition following us might have some 

 guide as to where to make a start. We also surveyed 

 the site for a dam to provide the necessary water 

 pressure for the hydraulic mining. 



This being accomplished, we made our way up the 

 valley to the great moraine near the mouth of Gold 

 Creek, and thence proceeded up the main valley. Every- 

 where were to be seen signs of the former presence of 

 the glacier. 



Ice-scratched blocks were strewn around on every 

 hand, while mounds and ridges of gravel encumbered 

 the wide floor of the valley. Here and there, where the 

 solid rock peeped through the covering of glacial debris, 

 its surface was polished and striated, and so fresh were 

 these markings that it was obvious the glaciation must 

 have taken place at no distant date. 



Some of the gravels consisted of rounded pebbles, 

 were highly current-bedded, and were obviously the 



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