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Carneddi Llwydion is a prehistoric round cairn situated in Wales. The monument comprises a mound of stone built over bedrock of the South Wales Upper Coal Measures Formation, a geological sequence of mudstone, siltstone, sandstone, coal and ironstone laid down during the Westphalian period. The ferricrete deposits within this bedrock would have been visible in the local landscape, their reddish iron-rich surfaces a distinctive feature of the geology surrounding the site.
Round cairns of this type typically served as burial monuments for Bronze Age communities, though their construction and use could span multiple periods. The cairn's construction would have been a significant communal undertaking, requiring the gathering and stacking of stone to create a substantial mound. The choice of location on this particular bedrock geology was likely determined by practical factors, including the availability of stone and visibility within the landscape.
Carneddi Llwydion is protected as an ancient monument by Cadw, the Welsh heritage agency, under the reference GM302. This statutory protection recognises its archaeological importance and ensures preservation of the monument and its potential to yield further evidence about Bronze Age burial practices and settlement patterns in Wales.
Carneddi Llwydion is a scheduled monument protected by Cadw under reference GM302. View the official record →
Carneddi Llwydion is a prehistoric round cairn situated in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference GM302.
Carneddi Llwydion 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.
Carneddi Llwydion 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 GM302.
Several scheduled monuments lie within 10 km, including Tomen y Clawdd (5.6 km), The Pottery, Nantgarw (6.6 km), Caerffili Mountain Shaft Mounds (8.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Carneddi Llwydion'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.
Carneddi Llwydion stands on South Wales Upper Coal Measures Formation, bedrock that formed in the Westphalian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.