NOTES ON THE CREMORNE BORE. 459 
and fourteen feet, the bearing being N. 21° 30’ E. and the distance 
sixteen and a-half miles. The chocolate shales at the Holt Suther- 
land Bore were struck at a depth of seven hundred and eighty- 
seven feet,* whereas at the No. 2 Bore at Cremorne they were 
struck at 1,020 feet, a total dip of two hundred and twenty-two feet, 
so that, whereas the coal measures dip six hundred and fourteen 
feet, the top of the Narrabeen beds and base of the Hawkesbury 
Sandstone has dipped only two hundred and twenty-two feet, 
which proves that the Narrabeen Beds thicken between Holt 
Sutherland and Cremorne three hundred and ninety-two feet in a 
distance of sixteen and a-half miles. 
The surface level at the Liverpool Bore is about forty feet, and 
the depth to the top of the main seam 2,584 feet 10 inches, so 
that the main seam dips from Liverpool towards the No. 2 Bore, 
Cremorne, two hundred and twenty-nine feet, the bearing being 
N. 53° E., and the distance twenty miles. 
These data are not sufficient to admit of the exact amount and 
direction of dip of the coal measures at Cremorne being calculated. 
From Coal Cliff to Holt Sutherland the dip is northerly at about 
one hundred and thirty feet per mile ; from Lithgow to Liverpool 
it is easterly at about sixty feet per mile without allowing for the 
downthrow fault and sharp monoclinal fold at Lapstone Hill, 
which amounts to perhaps about six hundred feet. If this six 
hundred feet be added, the dip from Lithgow to Liverpool would 
be about sixty-seven feet per mile. 
The general dip from the coast towards the No. 2 Cremorne 
Bore is westerly at one hundred and ten feet per mile. At 
Wyong, about forty miles northerly from Cremorne, the same 
chocolate shales which are about eight hundred and seventy-seven 
feet below sea-level at Cremorne, are at sea-level, dipping in a 
southerly direction. It is obvious from these facts that Sydney 
cannot be far from the centre of the great coal-field, which extends 
from near Ulladulla to Port Stephens, and from the sea coast to 
* Annual Report, Department of Mines, 1883, p. 197. 
