NOTES ON THE CREMORNE BORE. 451 
(4.) At Narrabeen a bore executed by Mr. Coghlan attained a 
depth of about 1,985 feet and failed to reach the coal measures.* 
The chocolate shales were struck at a depth of 379 feet 6 inches, 
and the purple and green tuffaceous shales representing the horizon 
of the cupriferous tuffs at a depth of 1,715 feet. Natural gas is 
stated to have been struck in this bore at a depth of 1,560 feet, 
and also at a depth of 1,200 feet in a bore within a few yards of 
the first. This natural gas was probably coal gas mixed with 
atmospheric air. The height of the bore above sea-level was 
about four feet. 
(5.) At Rose Bay near Sydney, Mr. Coghlan bored on the 
Cowper Estate, to a depth of approximately 1,700 feet. Neither 
coal measures nor gas were obtained at this bore. 
(6.) At Camp Creek, near the present site of the Metropolitan 
Colliery, about twenty-seven miles from Sydney, a bore executed 
by Mr. Coghlan was successful in reaching the Bulli coal seam, 
there about twelve feet thick, at a depth of 846 feet. Height 
above sea-level 336 feet. 
(7.) The bore put down by the Department of Mines between 
Waterfall and Heathcote, about twenty-three miles southerly from 
Sydney, struck the upper portion of the Bulli seam at a depth of 
1,513 feet, thickness four feet eight and a-half inches, and the 
lower portion six feet one inch thick at a depth of 1,583 feet ten 
‘inches. The chocolate shales were struck at a depth of 307 feet, 
and the cupriferous tuffs at a depth of 1,047 feet. Height above 
sea-level 4674 feet. + 
(8.) At Dent’s Creek near Holt Sutherland, the Diamond Drill 
belonging to the Department of Mines, struck the upper coal seam 
proved at the Heathcote bore at a depth of 2,228 feet, the seam 
being four feet two inches thick, and the lower seam at 2,2964 
feet, the thickness of the latter being five feet three inches. The 
* Annual Report, Department of Mines, 1890, pp. 233 —- 237.—Report 
by T. W. E. David. 
+ Annual Report, Department of Mines, 1885, [1866] p. 176. 
