The Influence of Salts in Rock Weathering. 



169 



other from the Happy Jack Mine at Comet Vale,'!^ the mine being 

 west of Lake Goongarrie, and about three-quarters of a mile dis- 

 tant from the lake's nearest point. 



Salts. Parts per cent. 



The predominance of common salt may be noted. 



The Happy Jack water is extremely salt for a water away from 

 a lake, but it shows how salt some of the underground waters are. 

 In its percentage and nature of solids, it is probably close to the 

 normal underground lake waters. These analyses show that there 

 are abundant salts to operate on the rocks in the way described. 



Space does not permit of detailed descriptions of particular 

 localities where the features described above may be seen, but as 

 examples of the flaking of hard greenstone rocks, reference is made 

 to the western shore of Lake Goongarrie, at the eastern end of the 

 " peninsula," between Comet Vale and Goongarrie.^ An example 

 of flaking of practically undecomposed granite occurs at the low 

 cliffs at the western end of an unnamed and unmapped lake to the 

 east of the Tiorth -eastern corner of Lake Goongarrie. The rectan- 

 gular outlines of siome of the undermined cavities, which are 

 largely due to vertical joints and other division planes, may be 

 seen at the extremity of the peninsula at Lake Goongarrie. 



1 Comet Vale is 63 miles north of Kalg:oorlie, 



2 Goongarrie is 55 miles north of Kalgoorlie. 



