292 



as an irregulai- in; 

 two roeks are in ti 

 what I have taken 

 traced out into the surrounding gi'anitc. but in all eases to no 

 great distanee from tiie main nuiss. Al)(iut half a mile to the west, 

 on the southern border of the area, is another snuiU outcrop of 

 epidiorite. but again the relationship is obscured by surface soil. 

 In both cases, however, the epidiorite occui-s at a lower level than 

 the general mass of the granite, and as l)efoi-e stated, frona tha 

 larger area veins of the epidiorite appear to run off from the main 

 mass into the neighbouring granite. Had it not been for the 

 evidence of the southern area I would not have hesitated in con- 

 cluding that the epidiorite was intrusive into the granite, and as 

 it is this conception accords best with the availaljle evidence. 

 Through the kindness of Mr. E. J. Dunn, analyses of the granite 

 and epidiorite have been made for me by Mr. A. G. Hall at the 

 Mines Department Laboratory. The analysis of the gi-ani\e has 

 already been quoted, but is given here for comparison with that of 

 the epidiorite, which is recorded for the first time. 



I. Granite, Dog Rocks, Geelong. 

 II. ]]pidiorite, Dog Kocks, Geelong. 



