BY A. B. WALKOxM. 55 



South Wales border, and a line drawn roughly from Ipswich to 

 ('anungra, and thence to the New South Wales border. In a 

 good deal of this area, they are overlain by volcanic rocks of 

 Cainozoic age, but there is no doubt that they are practically 

 continuous through the whole area. In addition, there is a belt, 

 live to fifteen miles wide, from Esk up the valley of the Brisbane 

 River nearly to Cooyar Creek, but this belt is not a continuous 

 outcrop; there is also an extension from Esk in a north -easterly 

 direction past Mt. Brisbane. 



Rocks belonging to the Walloon Series also outcrop verv ex- 

 tensively to the west of the Main Divide. There is probably a 

 continuous belt from the New South Wales border near Kil- 

 larney, running through Warwick to Dalby and Chinchilla, then 

 swinging round to an east and west direction parallel to the 

 railway-line past Roma. The exact extent of the belt past this 

 point is not absolutely proven, but there seems little doubt that 

 it swings round in a general north-north-westerly direction, and 

 extends right to the Gulf of Carpentaria towards Cape York. 

 Mr. Dunstan* has placed, in the W^alloon Series, sandstones and 

 shales in this belt at the following localities: the Upper Maranoa 

 River, the Upper Dawson River, Jericho, the Upper Flinders 

 River, Croydon, and probably the heads of the rivers flowing west- 

 erly across the Cape York peninsula to the Gulf of Carpentaria. 



This belt dips to the west and south-west, and underlies, with 

 apparent conformity, the marine Cretaceous rocks of the Rollins*- 

 Downs Series. In the east, the Walloon Series is represented 

 by a number of occurrences scattered over a very wide area. To 

 the south and south-west of Maryborough is the Tiaro Series 

 (equivalent to the Walloon Series); other occurrences include 

 those at Callide Creek, Westwood-Wycarbah-Stanwell district 

 Waterpark, Brovinia, a small area about 10-15 miles west of 

 Mundubbera, a small area west of the Burnett River in latitude 

 25° 45'S., a small area west of Barambah Creek in latitude 26°S 

 at Mondure on Barambah Creek, and the Laura Coalfield, Cook- 

 town district. The exact positions of these areas are shown on 



* Harrap's Geography of Queensland, 1916, p. 166. 



