Physiography oj Bulla Area. 347 



in the stream can readily be identified by the sniootli 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 which have acted us a guide to the matter in this paper. 



Thanks are also due to Mr. F. Watson for the chemical 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 g:iven here. 



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