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Cairn on Mynydd-March-Hywel is a prehistoric round cairn situated on the upland terrain of South Wales. The monument lies upon bedrock of the South Wales Upper Coal Measures Formation, a Westphalian-age sequence of mudstone, siltstone, sandstone, coal, ironstone and ferricrete that underlies this moorland landscape. Built from stone quarried from the surrounding high ground, the cairn is typical of Bronze Age burial monuments, constructed as a kerbed mound to mark and contain inhumed or cremated remains.
The monument's position on Mynydd-March-Hywel places it within an area of upland that would have been valued by prehistoric communities for grazing and hunting, as well as for visibility across the surrounding valleys. The industrial geology of the bedrock—rich in coal and ironstone—indicates the landscape's later economic importance, though the cairn itself predates all mineral extraction.
The site is protected by Cadw, the Welsh Government's historic monuments service, as a scheduled ancient monument under reference GM327. This statutory designation ensures the preservation of this significant Bronze Age burial structure for future study and public understanding.
Cairn on Mynydd-March-Hywel is a scheduled monument protected by Cadw under reference GM327. View the official record →
Cairn on Mynydd-March-Hywel is a prehistoric round cairn situated on the upland terrain of South Wales. It is designated a Scheduled Ancient Monument by Cadw under reference GM327.
Cairn on Mynydd-March-Hywel 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.
Cairn on Mynydd-March-Hywel 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 GM327.
Several scheduled monuments lie within 10 km, including Neath Abbey (7.1 km), Tennant Canal: Skewen Cutting and tramroad bridge (7.5 km), Carreg Hir Standing Stone, Pen-Rhiw-Tyn (8.7 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Cairn on Mynydd-March-Hywel'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.
Cairn on Mynydd-March-Hywel 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.