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Amgueddfa Cymru – Museum Wales
Upper section of relief model of Graig Ddu and Manod Quarry. This model is based on both Graig Ddu and Mynydd Manod quaries, Blaenau Ffestiniog and showing Mills of Manod quarry. The upper section consists of three separate colours with the following inscription on them "Chert with interbredded slate" on yellow background; "Slate" on dark green background; and "Upper Platey Slatey crystal Tuff" on light green background.
