124 VOLCANIC ROCKS OF SOUTH-EASTERN QUEENSLAND 



contain remains of dicotyledonous plants, fish, and reptiles 

 are most probably Tertiary, though they may be Cre- 

 taceous. In any ease these occurrences of volcanic rocks 

 are certainly post-Trias-Jura and most likely Cainozoic 

 in age. There seems to be a definite connection between the 

 trachytic material of the Redbank Plains and that along the 

 line of eruption from Mount Flinders to the Main Range, 

 so that there is additional evidence of a post-Trias-Jura 

 age for the middle and upper divisions of the volcanic 

 rocks at least. It will be noticed that all the direct evidence 

 as to age is based on fossil leaves with the exception of the 

 Oxley beds which in addition to dicotjdedonous plants 

 contain fisli and reptilian remains. As to the latter beds, 

 the question of age is merelj' one between the Cretaceous 

 and Cainozoic. The direct evidence is thus seen to point 

 to a Cainozoic age for the whole development. 



The indirect evidence, obtained from a correlation of 

 these rocks with similar ones in New ciouth Wales and 

 Victoria, is seen to be in accord with the above, and the 

 following table shows an interesting comparison between 

 the developments in the three States. 



