The Ingleton Coalfield was worked for 400 years. It is about 6 miles long by 4-mile wide and extends into the neighbouring parishes of Burton in Lonsdale and Thornton-in-Lonsdale. The coalfield terminates at the South Craven fault. The coal measures are shallow and represent the lowest layers in the Pennine coal measures sequence. The earliest coal mining occurred along the River Greta where Four Foot and Six Foot seams outcrop. Most deep mining was at New Ingleton Pit sunk in 1913. Its sinking led to the discovery of the Ten Foot seam (house and steam coal) at 127 yards, and the Nine Foot seam (steam and house coal) at 134 yards. Beneath them are the Four Foot seam (house, gas and coking coal) at 233 yards, the Three Foot seam (house and gas coal) at 236 yards and the Six Foot seam (steam and house coal) at 260 yards. Commercially viable deposits of fireclay lay under the Three Foot seam and pottery clay beneath the Six Foot seam used to make Ingleton Bricks.