1. Copperas house, Limb Valley. Copperas (ferrous sulphate) was manufactured here from the pyritic Ringinglow Coal seam, mined nearby

2. It is suggested that these inclusions were trapped as dust-like particles in the pyritic muds or iron sulfide gels on the surface of the alluvial fan.

3. Fossil fuels such as coal contain sulfur in two inorganic forms, pyritic sulfur (FeS2) and sulfates (Na2SO4, CaSO4, FeSO4), and organic forms such as sulfides, mercaptans, Bisulfides, etc

4. These were formed from pyritic muds and iron sulfide gels existing on the surface of the alluvial fan, and later were reworked as mud balls or fragments and deposited with the conglomerates.