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Amgueddfa Cymru
A possible slingstone made from a water rounded sandstone pebble. It shows little evidence of human modification or utilization. It was however brought deliberately to the site by human activity as other water rolled pebbles of its kind don't occur naturally in the vicinity.
Stones of this kind were often used in antiquity as shot for slingshots, this particular stone was found unstratified and without additional information it's impossible to say for sure that it was used with a slingshot.
Enw'r Safle: Five Mile Lane, Vale of Glamorgan