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Cairn 250m SW of Banc Llyn-Mawr is a prehistoric round cairn situated in Wales on bedrock formed from the South Wales Upper Coal Measures. The underlying geology comprises mudstone, siltstone and sandstone interspersed with coal seams, ironstone and ferricrete, deposited during the Westphalian period. This ancient monument, protected by Cadw under reference GM384, represents a burial or ceremonial structure built during the prehistoric era when communities in this upland region constructed stone monuments to mark significant sites.
Round cairns typically served as burial monuments or territorial markers, constructed by heaping stone gathered from the surrounding landscape. The geology of the Upper Coal Measures would have provided the building material: fragments of ironstone, sandstone and other rock types naturally exposed or quarried from the bedrock. Such monuments are characteristic of Bronze Age funerary practice across the uplands of Wales and the broader British Isles.
The cairn's location near Banc Llyn-Mawr places it within a landscape shaped by coal-bearing geology, a legacy of ancient deltaic environments. Today it remains an important heritage record of early prehistoric settlement and burial practices in South Wales, protected for future study and public understanding of the region's deep past.
Cairn 250m SW of Banc Llyn-Mawr is a scheduled monument protected by Cadw under reference GM384. View the official record →
Cairn 250m SW of Banc Llyn-Mawr is a prehistoric round cairn situated in Wales on bedrock formed from the South Wales Upper Coal Measures. It is designated a Scheduled Ancient Monument by Cadw under reference GM384.
Cairn 250m SW of Banc Llyn-Mawr 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 250m SW of Banc Llyn-Mawr 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 GM384.
Several scheduled monuments lie within 10 km, including Earthwork 1080m NNW of Fforest Newydd (5.6 km), Llandeilo Castle Mound (5.9 km), Clydach Upper Forge (7.9 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Cairn 250m SW of Banc Llyn-Mawr'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 250m SW of Banc Llyn-Mawr 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.