Slate was taken down the Croesor incline and on eventually to the dockside at Porthmadog. The construction of the incline and tramway structure above to the quarries is a remarkable testament to the ability of quarrymen. The valley is a classic Welsh u-shaped glacial valley.
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Keywords:blaenau ffestiniog, croesor, cymru, geology, glaciation, ice age, inclines, quarries, quarrying, slate, tramways, wales