42 GEOLOGY OF LOWEK MESOZOIC kOCKS OP QUEENSLAND, 



and to place on record my appreciation of the generous way in 

 which he has lent me all possible assistance. 



To other officers of the Geological Survey, I am indebted for 

 their willingness to assist me with their knowledge of these 

 strata in the field, especially Mr. W. E. Cameron, who has made 

 such a detailed study of the Ipswich Series in the Ipswich Coal- 

 field, and who has given me access to the information which he 

 has obtained for the preparation of his third report on this 

 field. 



For assistance in connection with the geology of the Lower 

 Mesozoic rocks in Western Australia, South Australia, and Tas- 

 mania, I have to thank Messrs. A. Gibb Maitland, L. K. Ward, 

 and W. H. Twelvetrees, respectively. 



To Professor David, I owe my introduction to the broader 

 problems of Australian Geology, and the resulting desire to assist 

 in the solution of some of the problems of Australian strati- 

 graphy. I have been inspired to carry out the palseo-botanical 

 portion of my work as thoroughly as possible, by the kindly 

 encouragement of Professor Seward. 



I am indebted to the authorities of the University of Sydney 

 for permission to publish this paper. 



Previous Literature. 



Most of the papers dealing dii-ectly with the subject of the 

 Lower Mesozoic rocks of Queensland, or their flora, have already 

 been briefly summarised in an earlier papei', but there are a few 

 additional papers to which reference may be made here. 



^Ir. C Hedley, in his Presidential Address to Section D of 

 the Australasian Association for tl)e Advancement of Science 

 in 1909, published two maps of the Queensland region in Meso 

 zoic time, one reproduced after Keumayr, showing the distribu- 

 tion of land and water in Triassic time; and the other original, 

 showing the same at the close of the Mesozoic Kra. 



Dr. H. I. Jensen, in a paper entitled '-The Building of Eastern 

 Australia,"* has many references to the Lower Mesozoic rocks. 

 The paper partakes rather of the nature of a summary of views 



"" Proc. Roy. Soc. Queensland, xxiii., Ft. 2, 1912, p.U9. 



