114 GEOLOGY OF LOWER MESOZOIC ROCKS OF QUEENSLAND, 



clines and synclines, whose axes are in a general N.30°W.-S.30°E. 

 direction. This folding is sometimes severe, the strata having 

 been fractured, the folding giving place to distinct faulting. The 

 age of this folding and faulting is Post-Lower Cretaceous and 

 Pre-Cainozoic ; none of the Cainozoic rocks in south-eastern 

 Queensland have been affected by it. 



In the Ipswich district, Mr Cameron has observed a sub- 

 sequent folding-movement with approximately meridional axes; 

 this latter folding has affected the Cainozoic sedimentary and 

 volcanic rocks, as well as the Lower Mesozoic rocks. 



In Western Queensland, the Mesozoic rocks have not been 

 subject to folding-movements. 



The Bundamba Series is practically devoid of fossils, but both 

 the Ipswich and Walloon Series contain abundant plant-remains; 

 there are also numerous fossil insects in the Ipswich Series. 

 Examination of the fossil floras indicates clearly that the Ipswich 

 Series must be regarded as Triassic in age, and the Walloon 

 Series as Jurassic. The exact position of the Ipswich Series in 

 the Triassic cannot be definitely fixed at present, but it seems 

 certain that it is Upper Triassic, possibly Rhsetic, but probably 

 older. The flora of the Walloon Series corresponds, to almost 

 equal extents, with Liassic and Lower Oolitic floras. This Series 

 probably corresponds to a period covering these two epochs, and 

 when the Walloon Series is known in greater detail, it may be 

 possible to subdivide it accurately. 



The exact position of the Bundamba Series in the Geological 

 Record cannot be fixed, but it is suggested that it is more closely 

 associated with the Ipswich Series than with the Walloon Series, 

 and, therefore, it is tentatively placed in the Triassic. 



A comparison of the Queensland Lower Mesozoic strata with 

 other occurrences in Australia of similar age seems to show, (1) 

 that the Narrabeen and Hawkesbury Sandstone Stages in New 

 South Wales are older than the Ipswich Series; (2) that the 

 Wianamatta Stage of the Hawkesbury Series in New South 

 Wales, and also possibly part of the Lower Mesozoic strata of 

 Tasmania are of the same age as the Ipswich Series; and (3) that 



