254 
ASHLEY: NOTES ON ADWALTON AND HALIFAX COAL. 
a line a few miles south of Thornhill, and on the west by its 
outcrop near Birstall. Its boundary on the east is referred to 
later. 
Upon reference to Plate XLV., which is taken from the 
Geological Survey Map on the scale of one inch to the mile, 
it is first seen on the north, just north of Middleton ; it crops 
out along the hill-side. Going west from Middleton, a pair of 
faults is met with throwing the seam down, and on the far side 
a small oultier occurs. A large fault, running in a south-easterly 
direction, half-a-mile to the north of Morley Main Collieries, 
throws tlie Middle Coal INIeasures against the Lower series. 
Further w^est, it again crops out on the hillsides in the neigh- 
bourhood of the village of Adwalton. To the south small 
oultiers occur west of the main body, formed by a complicated 
series of faults. A large fault, running east and west in the 
vicinity of Batle}^, again throws the seam out, and it is next met 
with on the eastern side of the valley between Batley and 
Dewsburv. To the south a complicated system of faulting 
occurs, making the outcrop very difficult to trace. 
Thickness of the Seam. At Middleton, on the northern 
outcrop, it is only \^ inches thick, at Morley 5 inches, at Gilder- 
some 9| inches, thinning down to 6 inches at Adwalton. To 
the east of Middleton, there is evidence that the cannel in the 
seam dies out, its place being taken by an inferior coal ; for 
instance, at Rothwell Haigh Colliery no cannel is found, and 
still further to the north-east the ordinary coal in the seam 
seems to have deteriorated, for at Woodlesford a seam of "bad 
coal" is found on the same horizon, after which it disappears 
altogether. 
In the neighbourhood of Batley various thicknesses are met 
with, all greater than are found in the north, the greatest thick- 
ness being at StainclifFe and at Clark Green, where it is proved 
16 inches thick. 
Passing southwards, it is 11 inches thick at Dewsbury Bank 
Colliery and at Briestfield, varying a few inches between these 
points. 
