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found about eighty yards apart, to the north-west the 
distance between them is as regularly only half, or a little 
more than half, that amount. 
From twenty to thirty yards above the Park Gate, over 
the district where this coal and the Flockton are furthest 
apart, lies a group of coals called Fenton's Seam, and a 
valuable ironstone known as the Black Mine. "Where the 
Park Gate and Flockton come closer together, these strata 
disappear. The coals are very variable, but sometimes 
amount in the aggregate to six or seven feet; this has led 
to attempts being made to work them, but all have, I believe, 
been given up, on account of the bad quality of the mineral. 
The ironstone is happily named; it consists of beds and 
nodules of a dark colour and deep black outside, embedded 
in black shale : the latter is crowded with Anthracosia, and 
the shells are also found, but less plentifully, in the ironstone 
itself. 
The Flockton Thin Coal cannot be recognised in the 
neighbourhood of Sheffield : about Flockton it is some 
fifteen inches in thickness, but of so pure a quality that it is 
largely worked as a house-coal : it lies there about thirty 
yards above the Old Hards. 
The Flockton Coal can be traced over the whole of the 
district we are describing : it consists of two beds, with a 
parting of very variable thickness. Hereabouts it is known 
as the Heward, and is of no value. About Barnsley the 
upper bed averages two feet, the lower fifteen inches, and 
the parting varies up to four feet: the top bed yields 
excellent house-coal. Further north this seam falls off in 
quality, and, in spite of its greater thickness, it cannot 
compete with the purer Flockton Thin bed. 
At from six to twelve yards above the Flockton Coal, lie 
the strongly-marked and very valuable ironstone measures 
known as the Tankersley or Mussel-bed Stone. The seams 
