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Mynydd Ton Cairns is a prehistoric round cairn situated in Wales on bedrock of the South Wales Upper Coal Measures Formation. The underlying geology comprises mudstone, siltstone, sandstone, coal, ironstone and ferricrete deposited during the Westphalian period. This stable foundation of mixed sedimentary rock would have provided a firm base for the monument's construction.
Round cairns of this type typically served as burial monuments during the Bronze Age, with stone heaps marking graves and ritual spaces across upland and moorland terrain. Built by stacking fieldstone gathered from the surrounding landscape, such cairns often contain cists or cremation deposits within their structure. The monument's location on elevated ground reflects the typical placement of Bronze Age burial monuments in prominent positions across the Welsh landscape.
The site is protected by Cadw, the Welsh heritage organisation, under reference GM540. This designation ensures its preservation as a significant element of the region's prehistoric heritage. The cairn survives as a physical record of early metalworking communities and their funerary practices, contributing to understanding of Bronze Age settlement and social organisation across South Wales.
Mynydd Ton Cairns is a scheduled monument protected by Cadw under reference GM540. View the official record →
Mynydd Ton Cairns is a prehistoric round cairn situated in Wales on bedrock of the South Wales Upper Coal Measures Formation. It is designated a Scheduled Ancient Monument by Cadw under reference GM540.
Mynydd Ton Cairns 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.
Mynydd Ton Cairns 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 GM540.
Several scheduled monuments lie within 10 km, including Mynydd y Gelli kerb cairn (2.8 km), Carn y Hyrddod & Neighbouring Cairn (2.8 km), Cairn Lwyd (4.7 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Mynydd Ton Cairns'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.
Mynydd Ton Cairns 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.