BY A. B. WALKOM. 5< 



It is thus seen that the Walloon Series extends uninterriipt 

 ediy over a great part of Eastern Queensland. Though occurring 

 iu comparatively small, isolated areas at the present time, I 

 believe that these occurrences represent the remnants of a de- 

 position which probably covered the greater pait of Queensland. 

 This will be discussed later. 



Further, that the western belt, extending past Toowoomba 

 and Warwick, probably extends a great deal further west than 

 is shown on the map, is indicated by the known occurrences of 

 Lower Mesozoic rocks to the south-west of Dalby, and west of 

 Warwick. 



Towards the south, this belt divides into two; the eastern 

 portion extends past Killarney into New South Wales, and is 

 continuous with the western extent of the Clarence Series; and 

 the western portion continues along the western margin of New 

 England, and dips away to the west under the marine Cretaceous. 

 In New South Wales, this latter belt is known as the Artesian 

 Series. 



It must be noted that the Walloon Series, in the Toowoomba- 

 Warwick District and in South-eastern Queensland, have pro- 

 bably been separated by heavy faulting along the Main Range, 

 but were formerly continuous; and it is quite natural, therefore, 

 that this Series should, in these two areas, be continuous with 

 parts of the Clarence Series of New South Wales. 



That the Walloon Series continues for great distances west- 

 ward under the Cretaceous rocks, is proved by the Artesian 

 bores of Queensland and New South Wales. It is fairly well 

 established now that the rocks from which the Artesian water 

 (or rather that part of it which is of meteoric origin) is obtained, 

 are part of the so-called Trias-J ura System, and not of the Cre- 

 taceous System. This fact is of great value in determining the 

 extent to which the Lower Mesozoic rocks continue under the 

 Cretaceous. 



Small Hows of water have undoubtedly been obtained from 

 the Cretaceous rocks, but the rocks from which the large flows 

 of water have been obtained are of Lower Mesozoic age. Ex- 

 amination of the bore-records, then, will show the extent of the 



