£. F. PITTMAN AND T. W. E. DAVID. CXXIII. 
depth of 2,330 feet, that is well into the Triassic Coal- 
measures. As the boring progressed below this depth, the 
flow of water continued to increase until it reached its 
maximum 800,000 gallons per day, at a depth of 3,560 feet. 
This evidence is conclusive, and proves that in New South 
Wales, at any rate, the Triassic sandstones, and not the 
Blythesdale Braystone form the storage beds of the artesian 
area. Moreover it is doubtful whether the Blythesdale 
Braystone extends into New South Wales territory, as 
nothing resembling it was recognised at the base of the 
Cretaceous rocks in either the Bulyeroi or Wallon bores. 
The respective levels of the base of the Cretaceous forma- 
tion in the Bulyeroi and Wallon bores shows that the bed 
of the Cretaceous Sea dipped rapidly northwards from 
Moree into Queensland. It is probable therefore that the 
Blythesdale Braystone of Queensland may have thinned 
out against a sloping surface of Triassic rock in the direc- 
tion of the New South Wales border. It may therefore 
act as a feeder to the underlying rocks of Triassic age. It 
is obvious from the facts adduced that the Lower Cretaceous 
rocks of New South Wales are essentially impervious, and 
do not form any important part of the storage beds of the 
artesian area. Lithologically they consist of marly and 
sandy shales and marine molluscan limestones. In (Queens- 
land and South Australia the sandy shales and limestones 
of this formation contain abundant foraminifera, with 
occasional infusoria and diatoms, but only a few microzoa 
of this kind have been observed in rocks of this age in New 
South Wales.’ Although there may be local evidence of 
thinning out of the basal beds of the Lower Cretaceous 
against the Triassic strata in New South Wales, no distinct 
evidence has been obtained in New South Wales as to there 
1 A Census of the Fossil Foraminifera of Australia, Proc. Austr. Assoc. 
Adv. Sci. for 1893 [1894], v., pp. 348 - 373. 
