Here's a fascinating video from the wonderful Standing with Stones documentary, a two hour journey exploring the Neolithic and Bronze Age sites of the British Isles. In this particular video, presenter Rupert Soskin is baffled by what appears to be a carved piece of petrified wood in a burial chamber on Anglesy:
When I traveled to the UK ten years ago one of my favourite experiences was visiting megalithic sites - from Stonehenge through to small barely-known arrangements in farmer's fields. ....

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