188 PROCEEDINGS OF SECTION 0. 



Should the coal-measures of the Burnim coal-field, which have 

 hitherto been regarded as belonging to the Burrum formation, be 

 representative of that formation, then the efEect of this determination 

 CI a Lower Cretaceous age will have a very far-reaching efEect ; for the 

 Ipswich formation of Queensland, the Clarence River series of New 

 South Wales, the lake sandstones of Gippsland and the Otways, in 

 Victoria, and certain freshwater coal-measures in Tasmania and South 

 Australia, are all regarded as being of identical age as determined by 

 the fossil plants contained therein. 



However, Dunstan* records that the coal-measures underlying 

 the marine beds are much more contorted than the Burrum coal- 

 measures, and also that they are traversed by numerous dykes. He 

 thus assumes that a stratigraphical uncomformity exists between 

 the underlying coal-measures and the Burrum coal-measures. Dunstan 

 also believes that the underlying coal-measures to which he gives the 

 name of the Tiaro formation are the equivalent of the Ipswich coal- 

 measures. 



If that is the case, then the Burrum coal-measures must be regarded 

 as being younger than the Ipswich formation and as being coal-measures 

 in the Rolling Downs formation analogous to those at Malta, east of 

 Tambo, at the head of the Bungeworgorai Creek, north-east of Mitchell, 

 and at Dalbydilla, in Queensland. f 



In conchisioD, I desire to express my thanks to Mr. B. Dunstan, 

 Mr. F. Chapman, and Professor E. W. Skeats for help in the preparation 

 of this paper. 



* Qld. Govt. JMiniug Jouruai, 15th December, 1912. 



t Jack and Etheridge. G30I. and Pal. of Qld. and New Guinea, p. 406. 



