126 PROCEEDINGS OF SECTION C. 



7.— A BIBLIOGRAPHY OF THE MINERALS OF AUSTRALIA. 



By. C. AyOERSOX, D.Se. 



(WITHDRAWN) 



NOTES OX THE FAUNA OF THE GYMPIE BEDS OF OUEENS" 



LAND. 



By II'. S. DUN. 



(To BE I'UBLISHED IN "RECORDS GEOt.. SuRVEY, N.S. WALES.") 



THE ALKALINE ERUPTIVE ROCKS OF WEST MORETON, 

 QUEENSLAND. 

 By R. A. iVEAR.XE, B.A., and W. G. WOOLNOUGH, D.Sc.F.G.S. 

 (Published i,\ Journ. R. Soc. N.S. Wales for 1911) 



10.— ON THE OCCURRENCE OF NEPHELINE IN PHONOLITE 



DYKES AT OMEO. 



by professor ernest w. skeats, d.sc, a.r.c.s., f.g.s. 



[Plate IX.J 



Introduction. — On two or three occasions in the petrographic 

 literature of Victoria the occurrence of one or other of the felspat- 

 hoids has been recorded. In Uhich's catalogue of the specimens 

 of rocks of Victoria in the Industrial and Technological Museum, 

 Melbourne, 1875, Nepheline is recorded from the older basalt of 

 Philip Island. In the second edition of the same book by J. Cosmo 

 Newbery, 1894, the same rock is described in identical terms, wath the 

 exception that apatite replaces olivine in the description. Therecan be 

 no doubt that the amended identification is correct. In Professor 

 Gregory's paper on the Geology of Mt. Macedon^ he records the 

 presence of nosean in the alkali rocks of this area. Mr. Summers 

 and myself, working in the same area, at first accepted this view, 

 and in a presidential address to Section C at the Brisbane meeting 

 of the Australasian Association for the Advancement of Science, in 

 1909, where I summarised the evidence we had obtained, I recorded 

 the presence of nosean in several of the rocks, and, in addition, 

 referred a peculiar minute prismatic mineral with internal fibrous 

 structure to the species melilite. Further work, however, on these 

 rocks has caused us to doubt the presence of nosean, and help from 

 Dr. Flett has enabled us to convince ourselves that the so-called 

 melilite is in reality a peculiar fibrous form of apatite. I am glad 

 to have an opportunity of making this correction. Lastly, Mr. 

 Mahony, working on the ejected blocks from L. Bullenmerri, at first 

 was inclined, I believe, to refer a colourless mineral to Hauyn, but 

 on further examination has referred it to analcite, and as such he 

 describes it in the published report.^ 



It- will be seen that all the references to the occurrences of 

 felspathoids in Victoria hitherto made appear to be incor- 

 rect. A few months ago, however, I was examining some 

 rocks from the collection left by Dr. Howitt to the Geological 

 Department of the University of Melbourne. Among them 

 was a collection of dyke rocks from the Omeo district in 



1 Ptoc. R. Soc , I'm/., 1901, p. 185. 



2 Momnirs fifo/. Siov. I'id., So, 9, 1910. 



