ARTESIAN WATER IN ROCKS OTHER THAN CRETACEOUS, 411 
Triassic or Jurassic age, and it is also proved that these rocks are 
artesian-water-bearing, and that they extend much farther to the 
eastward than the eastern boundary of our artesian basin, as 
tentutively laid down on the geological map of the Colony. It 
may here be remarked that it is only by information derived from 
bores and wells that the age of the underlying formations can be 
determined in most of the country hitherto referred to, for the 
reason that it consists of plains, the surface of which is covered 
by Plei$tocene and recent deposits. 
Ihave recently returned from a trip through part of Queens- 
land, and that portion of New South Wales lying to the north 
and north-west of Inverell, the object of my visit being to trace 
and map the eastern boundary of this newly discovered artesian- 
water-bearing basin. I find that on the Dumaresq River (the 
northern boundary of the Colony), it passes about fifteen miles to 
the west of Texas, and [ have, so far, traced it in a more or less 
south-westerly direction to the neighbourhood of Wallangra, the 
dip of the beds being to the west or south-west. If this boundary 
be assumed to continue so as to take in the Coonamble and. 
Nyngan bores, it will easily be realized that a very considerable 
addition must be made to the area of the New South Wales 
artesian basin as hitherto shown on our geological map. 
But if the discovery of artesian water in rocks of Triassic or 
Jurassic age be a matter of importance to New South Wales, it 
is, I think of still greater importance to the colony of Queensland. 
mr Fe. 1, Jack, the Government Geologist of that Colony, and 
his assistant, Mr, A. Gibb-Maitland, were engaged, during the year 
1894, in mapping the outcrop of the basal or intake beds of the 
Lower Cretaceous basin of Queensland. They found these beds 
to consist of very porous (bibulous) marine sandstones which Mr. 
: ack has named the Blythesdale Braystone, and which he described 
in detail in a very interesting paper read before the Australasian 
Association for the Advancement of Science, at its Brisbane 
ieeting in January last. Specimens of this Blythesdale PRY: 
also “ Artesian Water in the Western Interior of Queensland,” 
! See 
Bulletin No, 1—Geological Survey of Queensland, 1895 
