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Dating from around 4000 BC, the cairn at Dyffryn Ardudwy has two separate burial chambers. One of these is a type known as a portal dolmen. A flat slab on the mountainside was used as a base, this was flanked by several other slabs, side-stones and back-stones. A capstone was placed on top and a small ovoid cairn of stones built around three sides. The fourth side was the portal and had a small forecourt. Here a pit was dug and in it were formally arranged several flat stones, various shards of pottery from at least four pots, charcoal and soil. The pit was then filled with the cairn material and the mound completed.