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Nant Gwyn is a prehistoric round cairn situated in Wales, constructed upon bedrock composed of Ashgill rocks—a geological formation of mudstone, siltstone and sandstone dating to the Ashgill period. The monument sits within a landscape shaped by these sedimentary deposits, typical of upland Welsh terrain. The cairn represents a significant funerary or ceremonial structure from the prehistoric period, when such stone-built mounds served important functions within early communities.
The site incorporates a standing stone positioned to the south of the main cairn, suggesting a deliberately planned ceremonial arrangement. Such combinations of upright stones and burial mounds are characteristic of Bronze Age or earlier neolithic monuments across Wales and broader Britain, where landscape features were organised to reflect cosmological or territorial significance.
Nant Gwyn is protected by Cadw, the Welsh heritage preservation body, under reference CM343. This designation recognises the monument's archaeological importance and ensures its conservation for future study and public understanding of Wales's prehistoric past.
Nant Gwyn, round cairn and standing stone to S of is a scheduled monument protected by Cadw under reference CM343. View the official record →
Nant Gwyn is a prehistoric round cairn situated in Wales, constructed upon bedrock composed of Ashgill rocks—a geological formation of mudstone, siltstone and sandstone dating to the Ashgill period. It is designated a Scheduled Ancient Monument by Cadw under reference CM343.
Nant Gwyn, round cairn and standing stone to S of dates from the prehistoric period, and is classified as a round cairn. It is one of over 32,000 scheduled monuments protected across the UK.
Nant Gwyn, round cairn and standing stone to S of 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 CM343.
Several scheduled monuments lie within 10 km, including Bryn-Poeth-Uchaf, ring cairn to ESE of (1.1 km), Stone Circle 200m SW of Cerrig Cynant (1.4 km), Bryn-Poeth-Uchaf, ring cairn to NE of (1.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Nant Gwyn, round cairn and standing stone to S of'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.
Nant Gwyn, round cairn and standing stone to S of stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.