A six inch (0.15m) thick coal and a 24 inch (0.6m) seat earth overlie 9 feet (2.8m) of flaggy sandstone and siltstone with shaley partings at Park Wood Bottom in Keighley. This is the Thwaites Coal, which said to reach a maximum thickness of 24 inches (0.6m).
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)