BY A. B WALKOM. 41 



amination and revision of tlie floras of the Ipswich and Walloon 

 Series, the results of which have been published by the Queens- 

 land Geological Survey. 



The correlation of the Lower Mesozoic rocks of Australia 

 (based mainly on their fossil floras) and their exact position in 

 the Geological Record have been the subject of much discussion, 

 and different views regarding their correlation have been put 

 forward from time to time. In a summary of the literature 

 dealing with the Queensland Lower Mesozoic rocks,* I liave 

 already briefly summarised the majority of these views, and 

 there is no need to discuss them in further detail here. It is 

 sufficient to state that no finality has been reached on this point, 

 and, in many cases, conclusions have been based on insufficient 

 evidence. 



As a result of my examination of the Queensland fossil flora, 

 together with a consideration of the evidence of the fossil faunas, 

 and, in addition, general considerations of the stiata containing 

 the fossils, certain conclusions regarding the correlation of the 

 various series have been arrived at (see p. 95) which differ from 

 any previously put forward. 



Acknowledgments. 

 It is almost impossible to express the extent of my indebted- 

 ness to Mr. B. Dunstan, Chief Government Geologist of Queens- 

 land, in connection with the whole of my geological and palteon- 

 tological work in Queensland. He has placed at my disposal 

 every facility for examining the large collection of Mesozoic 

 plants in the possession of the Geological Survey; in addition, 

 he has made available to me a very considerable amount of 

 unpublished information, and permitted me to use such for the 

 purpose of making this paper as complete as possible. In the 

 section of this paper dealing with the extent and distribution 

 of the Lower Mesozoic rocks, much field-information is published 

 for the first time, and this is based almost entirely on informa- 

 tion supplied by Mr. Dunstan. I would like, therefore, to make 

 special acknowledgment of my indebtedness to Mr. Dunstan, 

 * Queensland Geol. Surv., Publication No. 252, p. 6. 



