144 ALEX. L. DU TOIT. 



Tlie position as regards the " Intake Beds" in Queens- 

 land now stands in a rather uncertain state; large areas 

 of so-called "Desert Sandstone" have been eliminated from 

 the map and the Blythesdale Braystones are being grouped 

 with the Rolling Downs series. For these reasons no 

 attempt has been made to delimit the artesian series on 

 the accompanying maps, the necessity for the omission 

 being greatly regretted. 



The important corollary that the Jurassic beds on the 

 north-eastern side of the Great. Dividing Range must also 

 act as "intakes," would apply to a limited degree only 

 in the Dawson River catchment, as can readily be seen 

 from Saint-Smith's section (II. pi. 25), the right hand half 

 of which obviously cannot be contributing anything to the 

 supplies struck at Roma or Wallumbilla for instance; fur- 

 ther to the north, however, their quota may be much more 

 considerable. However this may be, of paramount import- 

 ance is the conclusion that these porous Jurassic sand- 

 stones crop out along the flanks and even along the crest 

 of the main watershed, for it may be presumed that the 

 bulk, if not the whole, of the "Desert Sandstone" (still 

 called by that name on the latest geological map) between 

 Roma and Hughenden will prove to be really the fresh- 

 water Jurassic Series. They must be the same strata 

 extending north-westwards past Oroydon, described by 

 Gibb Maitland, 1 under the name of "Blythesdale beds." 



At Hughendeu their dip is a little steeper and the out- 

 crop narrower, while their base rests on granite or schists 

 at an altitude of just over 2,000 feet above sea-level at 

 Mount Miller, falling to about 1,800 feet along the railway, 

 and dropping to about the same level in Betts' Gorge Greek 

 to the north, where the beds are found in ravines that have 

 been cut through a great capping of younger basalt. 



1 A. Gribb Maitland, The Delimitation of the Artesian Water Area 

 North of Hughenden, Greol. Surv. Queensland, 1898. 



