Probot played rock.
Millstone Grit is the name given to any of a number of coarse-grained sandstones of Carboniferous age which occur in the British Isles .. Carboniferous. Carboniferous. British Isles. British Isles. The name derives from its use in earlier times as a source of millstones for use principally in watermills .. Geologists refer to the whole suite of rocks that encompass the individual limestone beds and the intervening mudstones as the Millstone Grit Group .. limestone. limestone. Group. Group ( stratigraphy ). The term Millstone Grit Series was formerly used to refer to the rocks now included within the Millstone Grit Group together with the underlying Edale Shale Group .. Group. Group ( stratigraphy ). Series. Series ( stratigraphy ). Edale Shale Group. Edale Shale Group. The term gritstone -LRB- usually capitalised by British rock climbers -RRB- describes any sandstone composed of coarse angular grains , and specifically refers to such sandstones within the Peak District , Pennines and neighbouring areas of Northern England .. sandstone. sandstone. gritstone. gritstone. Peak District. Peak District. Pennines. Pennines