E. F, PITTMAN AND T. W. E. DAVID. CXXYV. 
At Black Jack, and Curlewis near Gunnedah, their height 
above sea level is respectively about 1,670 feet and 1,730 
feet, and at Narrabri and Rocky Creek their height above 
sea level is about 2,250 feet. 
Thickness of porous beds as proved in bores.—At the 
Bulyeroi Bore (about 60 miles S.W. of Moree) artesian 
water was first struck at a depth of 1,386 feet in a bed of 
porous sandstone 160 feet thick. A fresh supply was struck 
at 1,8965 feet, and from here to the depth at which bed 
rock was struck, viz, 2,370 feet, the flow continued to 
increase, amounting to a total of 1,750,000 gallons per diem. 
Of the strata between the levels of 1,896$ feet and 2,370 
feet only about 30 feet were shales, the remainder being 
sandstones with a thin band of conglomerate. In this case 
the lower division of the porous beds has therefore a thick- 
ness of about 444 feet, and if to this be added the 160 feet 
‘of porous rock in the upper division the total thickness of 
porous beds belonging to the Triassic formation, at this 
bore amounts to about 600 feet. The Bulyeroi Bore was 
bottomed on bed rock. 
At Woolabra Bore, between Narrabri and Moree, the 
first water bearing strata were struck at 930 feet, and 
proved to be about 35 feet thick: the next were struck at 
1,125 feet and proved to be about 60 feet thick; the next at 
1,209 feet, thickness about 180 feet, which makes a total 
thickness of porous strata in this bore of 285 feet, Bore 
bottomed on hard rock. 
At the Tenandra Bore, yielding 1,200,000 gallons of 
water per diem, the first supply of artesian water was 
struck at 484 feet, and continued to increase down to a 
depth of 815 feet. Asthe intervening strata are described 
as sandstones and shales, and the shales are of course 
impervious, the porous beds must be considerably less in 
thickness than the strata between these levels, that is 
much less than 331 feet. Bore bottomed on bed rock. 
