Physiography of Bulla Area, 347 



in the stream can readily be identified by the smooth light-brown 

 .surface spotted with black augite crystals. Under the microscope 

 sections show that the rock contains perfectly fresh plagioclase, 

 augite, and olivine phenocrysts up to \ in. in diameter, set in a 

 finer paste. The rock closely resembles the Tweed Head basalt of 

 'Queensland. 



Acknowledgments. 



The writer is deeply indebted to Prof. E. Skeats for the interest 

 .and encouragement always given, and for the help, advice and sug- 

 gestions Avhich have acted as a guide to the matter in this paper. 



Thanks are also due to Mr. F. Watson for the cheraical analysis 

 of the Bulla granodiorite. 



The writer desires to acknowledge his great indebtedness to 

 Dr. H. S. Summers for his valuable criticism of the method of pre- 

 .sentation and of the matter given here. 



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