552 THE GEOLOGY OF NEWBRIDGK, NEAR BATHUR8T, N'.S.W., 



bedded, lenticular beds of limestone. The andesites are a portioir 

 of a large area stretching out to the west, and are rather decom- 

 posed and uralitised, sometimes with the formation of tremolitic 

 asbestos. The slates have been intruded b}^ a large granite 

 massif, part of that which forms the Bathurst plains, which 

 sent into the slate such vein-rocks as granite, granophyre and 

 aplite. The slate was considerably metamorphosed by these, 

 both at tlie contact and to some extent regionally. A good 

 series of contact-metamorposed slates can be traced towards the 

 massif, viz., slate passing into knotted slate, chiastolite slate, and 

 mica slate. Felspathic and augen slates also occur, but these are 

 more correctly referable to regional metamorphosis. 



The limestone has become marble, and in favourable localities 

 has been metasomatically replaced by copper ores, or changed by 

 a similar process into actinolite schists. The occurrence of a 

 chlorite schist has been noted, but its mode of origin at present 

 remains une.xplained. Lastly, the economic minerals have been 

 briefly described, and it has been shown that marble, iron ore, 

 and gold are the only minerals in this district likely to be of 

 much value. 



ix. — Conclusion. 



I am indebted to Mr. L. V. Puckle, Secretary to the Common- 

 wealth ^larble Quarries, Ltd., for information concerning, and 

 permission to inspect, the marble quarries; and to his quarry 

 manager, Mr. F. T. Campbell, for pointing out the smaller 

 occurrences of marble. 



Mr. H. J. Meldrum, B.Sc, has \'ery kindly anal3^sed the slate 

 for uie. My thanks are especially due to Dr. Woolnough, for 

 much advice and assistance in the preparation of this paper and 

 its illustrations. 



Note, — Since writing the above, I have learnt, from Mr. K. H. 

 Cambage, that basalt occurs capping Sugarloaf Hill. This is on 

 the northern border of Galbraith Parish, and I was unable to 

 visit it. 



