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Carn yr Arian Cairn is a prehistoric stone cairn located in Wales, built on bedrock of the Millstone Grit Group. This geological formation, dating from the Namurian period, comprises mudstone, siltstone and sandstone that would have shaped the landscape available to the monument's builders. The stone gathered for the cairn would likely have come from the local geology, as was typical practice for cairn construction across prehistoric Britain and Wales.
The cairn exemplifies the monumental building tradition of prehistoric communities, who used accumulated stone to mark significant locations, whether for burial, ritual or territorial purposes. Its construction required substantial labour and planning, suggesting a community with sufficient organisation and resources to undertake such work. The choice of this particular hilltop location, situated on the Millstone Grit bedrock, reflects the builders' knowledge of their landscape.
The monument is now protected under the care of Cadw, the Welsh Historic Monuments service, under reference BR244. This designation recognises its importance as evidence of prehistoric settlement and ritual practice in Wales. The cairn remains a tangible link to the communities who shaped the Welsh landscape in ancient times, preserved for present and future study.
Carn yr Arian Cairn is a scheduled monument protected by Cadw under reference BR244. View the official record →
Carn yr Arian Cairn is a prehistoric stone cairn located in Wales, built on bedrock of the Millstone Grit Group. It is designated a Scheduled Ancient Monument by Cadw under reference BR244.
Carn yr Arian Cairn dates from the prehistoric period, and is classified as a cairn. It is one of over 32,000 scheduled monuments protected across the UK.
Carn yr Arian Cairn is a Scheduled Ancient Monument, legally protected by Cadw — the body responsible for designating and safeguarding heritage sites in Wales. The official designation reference is BR244.
Several scheduled monuments lie within 10 km, including Glynneath Gunpowder Works (5 km), Dinas Silica Mine (5 km), Craig y Ddinas Hillfort (5.1 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Carn yr Arian Cairn's history, each drawn from the record and mapped to the exact spot:
Every location is different. Not every section appears for every place, only what the historical record actually holds turns up in a report.
Carn yr Arian Cairn stands on Millstone Grit Group [See Also Migr], bedrock that formed in the Namurian. The rock here is mudstone, siltstone and sandstone.