658 GEOLOGICAL NOTES ON KOSCIUSKO, 



During a brief visit in September, 1907, in company with Mr. 

 Leo A. Cotton, Junior Demonstrator in the Geological Depart- 

 ment of the University of Sydney, additional information was 

 obtained which is now embodied in this paper. 



A bibliography relating to Kosciusko has already been pub- 

 lished in the paper already referred to. 



ii. General Geological Features. 



In travelling from Cooma to Kosciusko, a distance of about 35 

 miles has to be traversed before the Snowy River is reached at 

 Jindabyne. The general nature of the section has already been 

 described in the previous paper, but later information suggests 

 the following additions or modifications. 



The gneissic granite at Cooma has now been proved to pass in 

 places into coarse mica schists with large dark pseudomorphs 

 after andesite. These schists are not only veined with pegmatite 

 containing large bunches of black and whitish-grey tourmaline, 

 but are interleaved with granite, of the nature of partly recon- 

 structed granite, to such an extent that one cannot say where the 

 schist ends and the granite begins; in fact the schist itself seems 

 to pass by insensible gradations into a reconstructed granite. 

 This granite is strongly foliated and has large crystals here and 

 there of adularia felspar which render it porphyritic. This belt 

 of rocks extends from Cooma to Pine Valley, a distance of a little 

 over 5 miles. The rocks are so unlike those of Kosciusko as to 

 justify the supposition that they may belong to a distinctly older 

 series. Lithologically they are not unlike the rocks of the Mitta 

 Mitta massif in Victoria, which are assumed to be of Pre- 

 Heathcotian age and probably Pre- Cambrian. Outwardly too 

 they very much resemble the Pre-Cambrian series which 

 stretches northwards from near the Murray Bridge in South 

 Australia, forming the eastern foot-hills of the Mount Lofty and 

 Flinders Ranges. 



Provisionally then I would suggest that they may be classed as 

 Pre-Cambrian. 



