12 
it is only four feet thick at Darton, while it is twenty-five 
yards at Sheffield. I also doubt whether it be well-judged 
to cross this Coal Field where the Silkstone coal is reduced 
in thickness to only two feet. If any rock in this coal district 
possesses its analogue in Lancashire, it is the red rock of 
Rotherham ; but the red rock of Rotherham is not identical 
with the Staincross rock, as Mr. Morton and Smith's map 
would lead us to suppose ; for the latter, in the Wentworth 
Section, is 100 yards below the former. And I am certain 
that there is scarcely any place in the country where there is 
a worse exhibition of the red rock of Rotherham than in a 
direction over Staincross heights. Mr. Morton then speaks 
of the Chevet rock being delineated ; but permit me to say 
that the Chevet rock of Smith, north of Darfield, and on the 
line of section, is nothing more or less than the upper portion 
of his red rock, as every person knows who studies geology 
from the country itself, and not from maps ; and that the 
Hooton Roberts rock — (which is above the Rotherham red 
rock, and preserves its character through the whole dis- 
trict, but is confounded with the Chevet rock by Smith 
in one part of his map, and not coloured at all by him in 
another, neither made mention of by Mr. Morton) — will 
be passed over in the line of section where nothing can be 
known or seen of it. 
If asked, then, what line would you recommend, I reply, 
an east and west line through Rotherham, over the coal 
district on the south side of the Don, over the toadstone, 
near Tidswell, and the mountain limestone near Buxton. 
Over this line, the Coal Field of Yorkshire is well known, 
containing at least fourteen beds of worked coal, viz. the 
Dennaby, Herringthorp, four feet coal, yard bed (Park 
coal). High Hazle, thick coal, Swallow Wood, Park Gate 
or Manor, Walker's thin, Sheffield coal, the Halifax hard or 
Pecten, Halifax soft, The Hallam coal, which is the lime 
coal of Lancashire, and below this a coal between the two 
