PROBLEM OF THE GREAT AUSTRALIAN ARTESIAN BASIN. 135 



THE PROBLEM OF THE GREAT AUSTRALIAN 

 ARTESIAN BASIN. 



By Alex. L. du Toit, d.Sc, F.R.s.s.Afr. 

 (Communicated by Mr. J. E. Oarne.) 



[Bead before the Royal Society of N.8. Wales, July 4, 1917.] 



I. Introduction. 

 II. The Physiography of the Basin. 



III. The Geology of the Basin. 



IV. The Temperature of the Waters : — 



(1) General. 



(2) Secular changes. 



V. The Salinity of the Waters.. 

 VI. The Gases in the Waters and their Origin. 

 VII. The Rising of the Waters under Pressure : — 



(1) Gas Pressure. 



(2) Rock Pressure. 



(3) Temperature Differences. 



(4) Hydraulic Pressure. 



(5) Sub-surface Springs. 



VIII. The Absorption and Transmission of Water: — 



(1) Absorption. 



(2) Transmission. 



(3) Interference of Bores. 



IX. The Early Tertiary History of the Basin. 

 X. The Relation between Volcanism and the Artesian Supply. 

 XI. The Closing History of the Basin. 

 XII. Conclusion. 



Table A. — Flows producible in Bores by Gases. 



Table B. — Friction in Bores according to Depth and Yield. 



Diagram T. Map of Basin showing Contours of Floor. 



„ II. „ „ ,, Temperature Gradients. 



„ III. „ ., ,, Salinity of Waters. 



,, IV. „ „ „ Isopotentials for 1912. 



