The Country round Lyell North-East 



appeared to run parallel to the Camp Fault, we called 

 the Lake Fault. 



From the top of the brown hill we could see away to 

 the north another stream which flowed across the line of 

 the fault, and then disappeared in a dark chasm of the 

 clint area. 



As the weather appeared once more settled we could 

 safely sleep out in the open, and therefore pushed on up 

 the lake-side with our sleeping bags and tent, and 

 camped for the night in a clump of fir trees at the head 

 of the lake, and at the mouth of a stream flowing down 

 a steep valley from the mountains. 



FIG. 24. 0, Silurian ; , Millstone Grit ; c, Carboniferous Limestone. 



The next day's work revealed the fact that the 

 mountains consisted of Carboniferous rocks which rested 

 with a marked unconformity upon shales of Silurian age. 

 The various beds were well exposed, and as the strata 

 were almost horizontal, there was no difficulty in ascer- 

 taining their approximate thickness by means of the 

 barometer. First there was a steep slope composed of 

 almost vertical Silurian shales, which was followed by 

 horizontal beds of Carboniferous Limestone, with a thin 

 conglomerate made up of fragments of the Silurian in a 

 limestone matrix, at their base. 



These measured 800 feet in thickness, and near their 

 upper surface were a few beds of shale, succeeded by 300 



153 



