090 
cliffe Muck. The Green Lane of Flockton agrees with this 
bed : it is a thin coal of poor quality. 
The Park Gate Coal, lying one hundred yards above the 
Silkstone, is one of the important seams of the district. It 
is made up of several beds, some " soft " or bituminous, and 
some "hard" or semi-anthracitic ; and the number and thick- 
ness of these beds and their partings vary very much from 
place to place. In the neighbourhood of Sheffield the whole 
thickness is from five to six feet, with from four to five feet 
of workable coal; about Barnsley the seam takes pretty 
regularly the form of two beds, with from four to six feet 
of coal, and from eighteen inches to nine feet of measures 
between them ; towards Kexborough and High Hoy land it 
becomes very much split up, and does not yield more than 
three feet of coal ; and about Flockton it is represented by 
the single bed of the Old Hards, averaging a foot and a half 
in thickness. 
Above the Park Gate Coal there lies a sandstone, the 
Bradgate Rock of William Smith, reaching in some places 
the thickness of fifty yards ; it forms a well-marked ridge 
from Pitsmoor, by Grimesthorpe and Wincobanks Wood, 
where it is quarried, up to Kimberworth. Northwards from 
this point it dies away, and is replaced by shale, setting in 
again for a space here and there, but never reaching the 
great thickness it has in this immediate neighbourhood. 
In the measures between the Park Gate and Flockton 
Coals, to which I shall next call your attention, there occurs 
a change in thickness so large and sudden as to deserve 
especial notice. About Sheffield the distance between these 
coals is some eighty yards, and about Barnsley not more 
than forty; and this thinning out has been proved by sinkings 
to take place within the space of little more than a mile. 
The change happens about the village of Dodworth; and 
while to the south-east of this point the coals are regularly 
