256 
ASHLEY : NOTES OX ADWALTON AND HALIFAX COAL. 
Of course, as will be seen, the vertical scale of the sections 
is very much exaggerated ; this is done in order to show the 
variation in the thicknesses. Only the top bed of the seam, 
which is invariably cannel coal, is shown. 
Underlying Strata. It is interesting to note the strata 
underlying this bed of cannel. 
The area over which this coal extends, as shown on the plan, 
does not indicate that the seam does not exist further to the 
south and east, but onh^ that the cannel bed found over this 
area ceases. The Flockton Thick Coal into which, as I have 
already stated, it gradually passes, is supposed to exist on the 
east, and is known to do so along its outcrop on the south, but 
owing to the dip of the measures it has never been proved 
further east than at the two points East Ardsley and Hartley 
Bank Colliery. 
On the south the section of the whole seam is, at Bunker's 
Hill Colliery, Stone Coal 10 inches. Brown Stone 2 inches, Soft 
Coal 10 inches. Dirt 1 foot 10 inches. Coal 1 foot. 
At Thornhill the section is: — Stone Coal 1 foot. Measures 
6 feet. Coal 1 foot. 
At Dewsbury Bank the shale between the two coals has 
decreased to about 2 feet. 
It will thus be seen that, except on the south, there is no 
Middle Coal ; further north, however, there are, as a rule, three 
beds of coal with thin partings between ; the top one is invariably 
cannel, the other two bright coal, although at Howley Park 
and adjacent collieries underneath the Middle Bed, which is only 
2 inches thick, there is found a bed of inferior cannel known as 
Hubbs." 
Thus it would appear that, as the cannel increases in thick- 
ness, the so-called Middle Coal thins out, and the writer suggests 
that the cannel thickens at the expense of the bright coal. 
At Morley Main Colliery the Bottom Coal is composed of cannel, 
and in some parts of the mine at Tingley all three seams are 
found lying together without any dirt partings, both top and 
bottom coals being cannel. The top coal is 5 inches thick and 
