66 Diorites and Granites of Swift's Creek, 



dark bluish or greenish in colour. I prepared samples of 

 both these rocks. A slice of the darker coloured rock (dull 

 green) showed me that the ground mass is, as in /, colourless, 

 and suggesting minute overlapping flakes. In this are vast 

 numbers of minute chlorite fibres lying over each other in 

 all directions. Traversing the mass are narrow and contorted 

 veins of quartz; chlorite fibres extend from the ground mass 

 into them, and their median line is marked by a chain- 

 like row of such fibres linked, as it were, to each other. 

 Besides these veins of quartz there are isolated grains 

 and lenticular masses of grains of quartz. A slice of a 

 somewhat more indurated and lighter-coloured sample from 

 a bed adjoining the former showed a similar structure ; but 

 in this the chlorite is rather in flakes than in fibres, and is 

 pale yellow or yellowish green in colour. In both varieties 

 of rock there are occasional angular fragments of plagioclase 

 round which the chlorite fibres have arranged themselves in 

 a pseudo-flow structure. 



As this point may be said to be the intermediate position 

 between the contact and regional schists, the beds, in going 

 northwards from this place across the strike, are increasingly 

 altered. Nodules appear in one set of beds, while those 

 alternating with them are indurated. The former are the 

 nodular argillaceous schists, and the latter are the micaceous 

 quartz schists before spoken of. At a distance of about ten 

 chains from g these have completely assumed their dis- 

 tinctive characters as members of the regional metamorphic 

 series of Omeo. 



Following the contact beyond the last section, I obtained 

 a third section across the contact, which I subjoin. 



Diagram No. 3.— Section across Contact at Swift's Creek. 

 Scale, about 150 feet to one inch. 



