Art. IV. — The Rocks of Noyang. 

 By A. W. Howitt, F.G.S. 



[Read lOfch May, 1883.] 



I. — Introduction. 



In a former paper I made the statement that I had observed, 

 when tracing round the boundary of regional metamorphism 

 at Omeo, the constant recurrence near it of tracts of intru- 

 sive igneous rocks.* The rocks which I described in that 

 paper formed one of those areas ; those which I am now 

 about to describe constitute another. 



Noyang, strictly speaking, is the native name of the place 

 where the road from Bruthen to Omeo first crosses the 

 Tambo River ; but I have applied it, as it is locally used, to 

 the whole tract delineated upon the sketch map which is 

 attached to this paper. 



In examining this locality it seems at first sight that the 

 regionally metamorphosed schists of Omeo do not extend so 

 far south as the northern boundary of the intrusive rocks of 

 Noyang ; but a more extended examination of the country 

 to the north of that boundary, as far as Ensay, has caused 

 me to see that the limits of the regional schists must pro- 

 bably be extended to the northern slopes of the Fainting 

 Range. I am not now prepared with the evidence necessary 

 to determine this question ; indeed, it would be beyond the 

 scope I have set myself in this paper, and may well wait 

 until I have prepared, by an examination of others of the 

 detached intrusive areas which border the regional schists, 

 for a consideration of the latter. 



It will be observed that in this paper I have followed 

 the terminology and classification established by Professor 

 Rosenbusch in his " Physiographie der Massigen Gesteine," 

 and lately presented by him, in a more systematised form, in 



* " The Diorites and Granites of Swift's Creek." Transactions of the Royal 

 Society of Victoria, Vol. XVI.,- p. 19. 



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