THE SUMARINE LEAKAGE OF ARTESIAN 

 WATEPi. 



By ROBERT L. JACK, F.G.S., F.R.G.S., 



Govermnent Geologist of Qtieenshiiid. 



{Read before the Eoijal Society of Queensland, Jnhj 11, 1896.^ 



In a paper read at the Brisbane meeting of the Australasian 

 Association for the Advancement of Science in January, 

 1895, I spoke of two kinds of leakage which might possibly 

 afiect the bibulous beds at the base of the Lower Cretaceous 

 formation: First, a leakage into the sea — "Suppose the beds 

 to dip seaward and beneath the sea, and either to rise to 

 the ocean bed or to dip at a lower angle than the slope of 

 the sea bed, there would be a leakage into the sea. And, 

 again, suppose (what we believe to be actually the case) 

 the outcrop of the beds to occur at gradually lower levels till it 

 attains the sea level, there would be a leakage in the form of 

 springs, or into river beds along the line." I then referred to 

 evidence in favour of the first kind of leakage — into the sea — 

 afterwards to be recapitulated, and in speaking of the second 

 kind of leakage, as springs where the intake-beds had their 

 outcrops at comparatively low levels, said: — " Nor is e\'idence of 

 the second kind of leakage to hand. The outcrop of the 

 Blythesdale Braystone, as it falls away from its highest altitude 

 . . . down to the Mclntyre River is not very conspicuously 

 marked by springs." In discussing a paper on the subject by 

 Mr. Walter Gibbons Cox, C.E., Mr. J. P. Thomson, President 

 of the Queensland branch of the Royal Geographical Society of 

 Australasia, endeavoured to show that the second kind of leak- 

 age is of considerable volume, in evidence of which he quoted 

 Julian E. Tenison Woods' observations"''^ on the occurrence of a 



' Australian Handbook," 1895 Edition. 



