Palaeozoic Geology of Victoria. 125' 



igneous rocks, phitonic and voluanic, confonii closely to the graplis 

 with the Dacites at the least acid end, and the granites of Galx), 

 Woolamai, etc., at tlie other end. 



Tlie quartz porphyrites of the Tara Range are found to occupy a 

 position corresponding very closely with that of the Gabo Island 

 granite, and as has been shown petrographically, it is with a granite 

 of this type that they appear to be associated. 



It Avould appear, therefore, that the acid rocks of the Snowj' River 

 Series belong to an acid alkali province, in contrast to the acid 

 sub-alkali province, to which the dacites and grano-diorites belong, 

 but all conforming to a normal variation curve. 



It would be further interesting to consider the position and rela- 

 tionshii^ of- the andesites, but these rocks are much altered and de- 

 composed, and. so far, no specimens suitable for analysis have been 

 obtJained. 



It is worthy of note also that porphyries and rhyolites of the 

 Wellington Series form again a more acid series than those of the 

 Snowy River. 



100.27 100.67 100.11 100.85 98.67 99.99- 



1. Quartz Porphyrite, No. lOU, Mt. Tara Ramg^e. 



— Analyst E. O. Teale. 



2. Quartz Porphyritie, No. 105, Mt. Tara Rang-e. 



—Analyst E. O. Teale. 

 .3. Quartz Porphyry, Federal Territory. 



—Analyst A. G. Hall. 



4. Quartz Porphyrite, Violet Town, Strathbogie Eange. 



— 'Analyst G. Ampt. 



5. Quartz Ceratophyre, No. 68, Nowa Nowa. 



— -Analyst E. 0. Teale. 



6. Quartz Ceratophyre, Navig-ation Creek, Noyang. 



— Analyst A. W. Howitt. 



7. Granite, Gabo Island. 



— -Analyf/t J. Watson. 



