The Pennine Coal Measures Group is the coal-bearing sequence of rock strata across the United Kingdom's Carboniferous Westphalian Stage, spanning the Langsettian to Bolsovian ages and underlying coalfields in northern England, the Midlands, Wales and southern Scotland. It is divided into Upper, Middle and Lower Coal Measures formations of mudstone, sandstone and numerous coal seams, with marine bands that geologists use to correlate strata between separate mining districts, and it was for generations a major source of Britain's coal.
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