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Geology

  • The rocks of Todmorden Moor are of the Carboniferous series and are made up of shales, mudstones, sandstones and gritstones. These tend to be laid in alternating layers with the shales and mudstones predominating.
  • Part of the moor is made up of rocks of the Millstone Grit Series, with Lower Coal Measures making up the other part. Vegetation trapped between beds of shale has been changed into seams of coal. Rare coal balls have been found within these seams. (More info on coal balls) Below the coal seams are beds of fireclay, which has formed from the soil in which the vegetation grew.
  • The geological situation is made complex because the massive Deerplay Fault, running NW to SE, divides the moor. Major faults such as this are multiple fractures that jumble and reposition sections of geological strata. Also there is an irregular system of minor faults running mostly east to west.
  • This faulting means that most of Todmorden Moor's mineral workings have been small scale affairs, because the coal seams and other valuable strata have been fragmented and displaced unpredictably,
  • The varied geology means the moor has provided coal, fireclay for making pipes, mudstones for brick making and stone to make sand, hardcore and building stone.
  • For more details click here