NOTES ON THE CREMORNE BORE. 457 
excellence for smelting purposes in those cases where it has to 
resist a heavy furnace burden. It will be seen by reference to 
the report last quoted, that in some tests made by Professor 
Warren, samples of the Bulli coke resisted a pressure of from 
2,400 to 3,100 ibs. per square inch—a pressure which was largely 
in excess of that withstood by any of the other specimens of foreign 
or colonial coke experimented with. 
G'as.—Coal gas was given off abundantly from the coal core for 
over two hours after it had been drawn to the surface. The coal 
dust floated up in the water which was being circulated in the 
borehole by the force pump in the process of drilling, discharged 
coal gas so copiously that it bubbled up strongly through the 
water, and was readily ignited, burning with a bluish flame six to 
eight inches in length. It will be recollected that gas, probably 
coal gas mixed with atmospheric air, was given off from both the 
bores for coal at Narrabeen. It was probably derived from the 
Same seam as that struck at Cremorne, and was conducted into 
the Narrabeen bores possibly by an oblique joint in the strata, 
which intersected one bore at a depth of 1,200 feet, and the other 
at 1,560 feet. 
IV. (a) Details of No. 2 Cremorne Bore.—The following is a 
generalised section of the strata penetrated in this bore from the 
surface down to the total depth 2,929 feet :— 
Thickness. Total depth. 
iu. ine - Aine 
(Hawkesbury Sandstone ... 1,020 6 1,020 
( (a) Chocolate shales... 1638 6 1,184 O 
| (b) Sandstones, shales } 
and conglomerates, 
with Thinnfeldia, | . 
Sphenopteris, Sagen- 11,112 6 2,296 6 
opteris, Macroteniop- f°” 2 
teris, Odontopteris, 
Schizoneura, and 
Estheria. 5) 
(c) Tuffaceous dark ) 
green gritty shales— | 
horizon of the Cupri- U 
ferous tuff of the { 
Holt Sutherland and | 
Heathcote bores. J 
(d) Sandstones, shales : 
| and conglomerates i 560 0 2,917 0 
Triassic—Hawkesbury + 
Series. | 
ee 
Narrabeen Beds. 
—— 
60 6 2,357 O 
