60 GEOLOGY OF LOWER MESOZOIC ROCKS OP QUEENSLAND, 



Australia, for supplying me with all available information re- 

 garding this bore. Mr. Ward also remarks that the bores sunk 

 by the South Australian Government, with tlie exceptions of 

 Hergott and Marree at the margin of the basin, have failed to 

 reach bedrock. In other bores in the north-east of South Aus- 

 tralia, water is obtained from sandstones at great depths, in- 

 dicating surely the presence of equivalents of the Walloon Series. 

 e.g., Uoyder's Lagoon Bore, 4,700 feet: Mount Gason Bore, 4,420 

 feet; and others. 



Examples of palteontological proof of the age of the sandstones, 

 carrying the large supplies of artesian water, are quoted above 

 {see p.o8). and these show that the presence of artesian water is 

 an indication of the existence of the Lower Mesozoic Sandstones, 

 and can be used in the determination of the extent of these 

 beds. 



{y) Foldiny -movements In studying the folding-movements 

 to which the Lower Mesozoic rocks of Queensland have been 

 subject, two areas may be considered separately, viz., {a) the 

 western belt, extending from the Cape York Peninsula to the 

 New South Wales l)order, and (6) the occurrence in South-eastern 

 Queensland, (a) The western belt has not been subject to any 

 considerable movement, and the rocks usually dip gently to the 

 west and south-west beneath the marine Cretaceous strata; oc- 

 casional high angles of dip have been observed. (6) In South- 

 eastern Queensland, a study of the distribution and directions 

 of dip shows that the Lower Mesozoic rocks have been consider- 

 ably folded, and that the folding in some cases gives place to 

 faulting. The folding takes the foi-ni of a series of anticlines 

 and synclines, whose axes are in a direction approximately N.tJ0° 

 W.-S.30°E. The distribution of the Lower Mesozoic strata in 

 S<juth eastern Queensland has never been thoroughly understood, 

 but the recognition of this series of folds seems to explain the 

 distribution in a simple and reasonable manner. In places, the 

 folding gives place to faulting, e.y..^ north of Ipswich, and pro- 

 bably also near Hemmant. Mr. Ball has also described a fault 

 near Woodford,* which he believes to represent a continuation 



■' Queensland (government Minin^^ Journal, xvii., 1916, p. 169. 



