SUBTERRANEAN MOVEMENTS, &c. 
129 
From below, in the direction of Boll and, rises a thick series of 
millstone grits, and shales, inclosing near the bottom two coal seams, 
the lower one is from eighteen to thirty inches in thickness, and cor- 
responds to that of Penyghent. This has been worked at Mewith, 
Bentham, Tatham, &c. None of the coal pits to this seam pass through 
red sandstones. The Mewith pits on the line of section give (according 
to Mr. Hodgson) 
Gritstone, rather coarse grained 
Feet. 
... 24 
Plate or bluish shale ... 
... 21 
Soapstone ... 
5 ' 
Grit rock, with thin partings of shale 
... 36 
Plate, sometimes absent 
5 
6, and less. 
Grit rock, roof of coal 
6 and more. 
Coal 
1 
6 
One of the most extensive of these coal 
sections is 
that of Smear 
hall, near Wray, Lancashire, (given me by Mr. Hodgson.) 
Marl ... .. ... 
Shale with ironstone bands 
Feel. 
| 106 
Fine white rock 
... 30 
\ 
Soft bands ... 
1 
Coal (called Crow Coal) 
.... 0 
2 to 9 inches. 
Freestone post ... 
1 
6 
Black and rock layers 
... 12 
Coal 
1 
6 
Sill 
... 
Fine rock ... 
5 
Millstone grit, coarse grained ... 
... 27 
Plate 
... 210 
Here we see plainly the affinity to the Penyghent coal : the 
subjacent millstone grit is thin, and the Bolland shale is without any 
trace of the main limestone. The collieries of Farlton near Hornby, 
Tatham School near Lancaster, and Clints field near Low Bentham, agree 
almost exactly with the above section, but do not go below the coal. 
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