Two seams of coal outcrop about 0.5 km south-west of Stanbury, near Haworth, but mining was concentrated on the Upper or Main Coal which occurs in the shale below the Scotland Flags and above a very hard form of sandstone, known locally as Keighley Blue Stone. This coal, which varied in thickness from 0 to 12 inches, dipped to the south-south-east. The lower seam was only around 4 inches (0.1m) thick.
Gill, M.C. “Great Dales Coalfield, Eastern Areas” British Mining No.86 (2008), pp.68-108
Gill, M.C. Keighley Coal (British Mining No.74, 2004)