Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams.The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure.
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Gallery Archive . EVENTS 2015 : "Plotting Plymouth 's Past – the Boundary Stones Project" Nigel Overton started off by explaining how a small group of volunteers from the Old Plymouth Society had set out in late 2012 to revisit the 1500 known sites containing boundary stones of all descriptions and to record them on a new internet database.