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Carboniferous Mudstone found in Lancashire supplied by weight, comes in a polythene bag with an information label.
Mudstone is a very fine grained sedimentary rock composed of clay minerals & silt sized quartz grains that lacks a well developed bedding structure or fissility. This lithology is typically associated with low energy environments such as tidal flats, lakes or deep marine. This example is from the Carboniferous of Lancashire and is instead supplied in various random sizes by weight.