An outcrop of what has been called the Haworth Coal, below the Reticulceras reticulatum mut ß marine band, starts at a north-west trending fault, south of Lower Laithe Reservoir and about 400 metres west of the dam, and runs north-eastwards for 1.2 km to an east-west trending fault. A shaft at Hob Nook, about 800 metres west of Haworth, showed the 20 inches (0.5m) thick coal to be under the Doubler Stones Sandstone, dipping southwards at 1 in 12.

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)

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