BY A. B. WALKOM. 47 



Walloon Series in this area, Mr. Dunstan has proposed the 

 name " Tiaro Series."* 



Of the two formations which were united to form the so-called 

 Trias-Jura System, then, one has been removed into the Creta- 

 ceous System, and the remaining one (the Ipswich Formation; 

 is that which was originally regarded as the probable equivalent 

 of the Jurassic System. 



The Ipswich Formation was divided into three Series by Mr. 

 Cameron, viz.: Ipswich Series, Bundamba Series, and Walloon 

 Series. The use of the terms Ipswich Formation and Ipswich 

 Series (part of the Ipswich Formation) has probably led to a 

 certain amount of confusion, but the removal of the Burrum 

 Formation to the Cretaceous System renders the use of the name 

 Ipswich Formation superfluous, and it would be an advantage 

 to abandon it. 



(6) Geological Succession. — The Lower Mesozoic rocks of 

 Queensland consist of three Series, viz.: — 

 3. Walloon Series (Upper). 

 2. Bundamba Series (Middle). 

 1. Ipswich Series (Lower j. 



The complete succession is found only in South-CHstern Queens- 

 land, where a considerable amount of detailed geological work 

 has been carried out, chiefly because both Ipswich and Walloon 

 Series ccmtain workable coal-seams. 



Ihe Ipswich district has been examined in detail bv Mr. 

 Cameron, who has published two reports on the area,t and is 

 preparing a third, incorporating the results of recent develop- 

 ments in the district. 



South-east Moreton has been the subject of investigation by 

 Mr. E. O. Marks, late of the Queensland Geological Survey, 

 whose results are embodied in a publication entitled "The Coal- 

 Measures of South-east Moreton. '| The examination of the 

 continuation of the Coal-Measures, from the area examined by 



* See Rept. Second Interstate Conference on Artesian Water, Brisbane, 

 IftU, p.7. 



t Queensland Geol. Surv., Publications 147, 204. 

 X Queensland (ieol. Suiv.. Puljlication 22o. 



