ASHLEY : NOTES ON ADWALTON AND HALIFAX COAL. 
255 
In the extreme south, as in the north, it gradually thins 
out, the cannel being replaced by ordinary coal. This is proved 
at various collieries — Overton, Grange Moor, and Prince of 
Wales' — where the seam is known as the Flockton Thick Coal, 
having a thickness of about 3 feet 6 inches, divided by a bed 
of shale of varying thickness. 
On the east, unfortunately, it has only been proved to a small 
extent, owing to the dip of the measures in this direction, whereby 
tlie seam is overlaid by newer beds and runs deeper than any 
existing pits ; but at the two most easterly points where it has 
been proved, viz., at East Ardsley Colliery on the north, and on 
the south at Hartley Bank Colliery (west of Horbury) it is 
respectively 3 inches and 4 inches thick. 
It will thus be seen that both on the north and south there 
is actual evidence of the cannel having altogether died away, 
and on the east the evidence is strongly in favour of the same 
thing having taken place. 
Plate XL VI. represents horizontal sections of the seam, 
which show very clearly the thinning out and the variable 
thickness of the bed. The horizontal scale is a half inch 
to tlie mile, the vertical scale being a half inch to the foot. 
Fig. 1 is a section running north and south, starting at 
Briestfield with the cannel 11 inches thick, from which point it 
gradually thins down to 5 inches at Morley, the furthest point 
north on this lins that I have any information about. The 
coal is then cut off by the large fault bringing in the Lower 
Coal Measures. 
Fig. 2 runs from Adwalton on the west, showing a gradual 
thickening until Tingley is reached, from which point it again 
thins down to East Ardsley, where it is only 3 inches thick. 
Fig. 3, section running approximately east and west and 
showing the greatest recorded thickness at StainclifFe (16 inches). 
From StainclifFe it gradually thins down to East Ardsley, where 
it is only 3 inches. 
The extent of the coal on the south is so small that it has 
not been possible to draw any section east and west through it. 
