48 
Magnesian Limestone formation at Owston, Carcroffc or 
Knottingley, or even still further eastward at Reedness, or a 
little to the southwards of the neighbourhood of Selby ? At 
Dukinfield, in Cheshire, the shaft to the bottom of the 
"Black Mine Bed'' of coal is 690 J yards from the ground, 
and this is the greatest depth at which coal is at present 
worked. 
Mr. Bingham, at Ince, near Wigan, has just proved a 
seam of coal known as the Arley, at the depth of 810 yards. 
When the dib-hole at the bottom is sunk, this shaft of the 
deepest colliery in Lancashire will be 820 yards from the 
surface. At Owston and Carcroft, trial holes have already 
pierced through the Magnesian Limestone to a depth of 90 
yards, and at Reedness, near Goole, another bore hole has 
been driven through the sandstone to a depth of 314 yards. 
If these trial holes should be continued, and coal struck, 
they will prove the truth of the theory of Mr. Woodhouse. 
Between Woodlesford and the town of Pontefract the map 
is crossed by four diagonal lines. These lines mark the 
directions of the faults, throws, or dislocations breaking this 
coal field between Woodlesford and Pontefract on the E. 
side of the Lancashire and Yorkshire Railway, into five 
separate divisions. From Methley Hall to near Allerton 
Colliery the throw up to the North is 70 yards ; from near 
Altofts to the Leadstone pinfold the throw up to North is 
again 70 yards ; and from the Bay Horse Inn, AYarmfield, 
to Newton Colliery, the throw down to south is 90 yards ; 
the throw by Pontefract Park being not yet proved. 
At the Stanley Hall Estate the Stanley Main bed of coal 
is reached at a depth of 120 yards, and at Heath Common, 
156 yards below the surface of the ground. 
In the Methley division, at the Fox Holes Collieries, the 
Stanley Main is reached at 130 yards, and at Allerton By- 
water at 127 yards. 
