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Amgueddfa Cymru – Museum Wales
All the sides of this stone are naturally worn, except one fire cracked side and the top, which has a very smooth concave surface. It could possibly have been used as a saddle quern before being burnt.
It is Lithology A: Pale grey, unfossiliferous, well sorted, fine to very coarse grained orthoquartzite, commonly with granules and occasionally with small pebbles of vein-quartz. The rock is lightly to moderately cemented with secondary quartz and has a marked porosity. This is the most common Lithology of the Severn Estuary sites.
Site Name: Peterstone, Peterstone Wentloog
