46 GEOLOGY OF LOWER MESOZOIC ROCKS OF QUEENSLAND, 



be determined from the contained fossil plants. The fossils, 

 which were available from the Burrum Formation at the time, 

 were, unfortunately, fragmentary, and were not a representative 

 collection. Further collections have been obtained from time to 

 time since, and a cursory examination of the material now avail- 

 able in the Geological Survey collections shows distinct differ- 

 ences from the floras of the Ipswich and Walloon Series. It is 

 intended that an examination of the Burrum flora will be under- 

 taken after the completion of the present paper. 



In 1907, Mr. Cameron, in discussing the age of the Ipswich 

 Formation, says* " The evidence for considering the Burrum 

 Beds as belonging to an earlier period of the Trias- Jura is not 

 conclusive. The two formations have long been considered as 

 identical in age by the Geological Survey, and the recent obser- 

 vations of Mr. Jensen lend confirmation to that conclusion.'' 



Our present knowledge shows that a large part of what was, 

 at that time (1907), regarded as part of the Burrum Formation, 

 is actually a continuation of the upper series of what was con- 

 sidered then as the Ipswich Formation. Dr. Jensen had 

 recorded the fact that these were continuous in the field in the 

 neighbourhood of Point Arkwright.f 



The question of the age and extent of the Burrum Formation 

 has, however, been established beyond doubt by the obser\ations 

 in the field of Mr. Dunstan. As a result of these observations, 

 it is now certain that the Burrum Series, in the Maryborough- 

 Howard district, overlies, with apparent stratigraphic conform- 

 ity, | rocks of marine origin, whose contained fossils indicate a 

 Cretaceous age, probably equivalent to the Rolling Downs Forma- 

 tion of Western Queensland. JV'Ir. Dunstan has also shown that 

 the strata to the south and south-west of Maryborough, origin- 

 ally mapped as part of the Burrum Formation, dip towards the 

 north-east beneath the marine Cretaceous rocks, and are equiva- 

 lent to the Walloon Series. For these equivalents of the 



* Queensland Geol. Surv., Publication No. 204, pp.12, 13. 

 t Proc. Linn. Soc. N. 8. Wales, 1906, xxxi., pp. 74-75. 

 t Ann. Rept. Dept. Mines, Queensland, 1911 (1912), p. 195; Queensland 

 Govt. Mining Jouin., xiii.(1912), p. 641, 



