126 Transactions of the Royal Society of Victoria. 



position, and stratigraphically inferior to the Devonian 

 formations at Bindi. 



The general appearance of the regionally metamorphosed 

 members of this sequence of beds, as seen at the Omeo Plains 

 and at the upper part of Wilson's Creek, is that of a series of 

 fine-grained and sometimes nodular or spotted mica schists, 

 approaching phyllites in places, and which alternate with 

 fine-grained to coarser quartzose beds, all being tilted at 

 high angles of dip, on an approximately north-western 

 strike. This amount of metamorphism decreases towards 

 the Bowen Mountains, and increases towards the fault. It 

 becomes especially marked near the contact, or where, as at 

 Wilson's Creek, there are outlying patches of the intrusive 

 rocks. The distance to which the increased amount of 

 metamorphism extends, varies. It may be taken at about a 

 quarter of a mile, at Hinnomunjie Morass, while at Wilson's 

 Creek it is not less than a mile. This increased alteration is 

 shown also by the presence in almost all the samples which 

 I examined from the altered zone, of microscopic crystals of 

 tourmaline in great numbers. The general change in the 

 schists, which may be attributed to the action of the intrusive 

 granites, seems to have been at Hinnomunjie Morass a more 

 complete crystallisation of the previously (regionally) meta- 

 morphosed sediments, in larger plates of muscovite and 

 biotite micas, and the production of numerous crystals of 

 tourmaline. 



Analagous alterations occur at Wilson's Creek at a distance 

 of a mile from the contact, but are there partly due to the 

 influence of strong masses of granite outlying from the 

 contact. The changes seen in proceeding towards the contact 

 at Wilson's Creek, are the appearance of grains of felspar in 

 increasing numbers ; the formation in portions of the schist 

 of what I am inclined to term a '' ground-mass " of orthoclase 

 and quartz, and the increasing silicification of the rock. 



Finally, there are for some little distance from the margin 

 of the porphyritic granites, a set of crystalline granular 

 rocks, which in some respects resemble both series, and as to 

 which I am unable at present to determine to my own 

 satisfaction, whether they are re-crystallised schists re-acted 

 upon by the granitic exudations, or abnormal forms of the 

 intrusive rocks. 



Certain distinctions may therefore be made between the 

 metamorphic rocks in this locality. The first group includes 

 the regionally metamorphosed schists on the eastern side of 



