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Carn Pen-y-Clogau is a prehistoric round cairn located in Wales and protected by Cadw as a scheduled monument under reference CM257. The site sits upon bedrock of the Millstone Grit Group, a sequence of mudstone, siltstone and sandstone deposits laid down during the Namurian period of the Carboniferous era. This substantial stone foundation would have provided a stable base for cairn construction and likely contributed suitable stone for building.
Round cairns of this type were constructed throughout prehistory, with notable concentrations in upland regions. These monuments typically served as burial structures or ceremonial markers, constructed by heaping stone gathered from the surrounding landscape. The Millstone Grit geology prevalent in this area yields characteristic durable stone well-suited to cairn building, and such stone would have been readily available during the monument's construction.
Carn Pen-y-Clogau remains an important record of prehistoric activity in the Welsh uplands. Its survival and scheduling reflect the archaeological significance of round cairns in understanding burial practices and land use in prehistoric Wales. The monument's preservation enables ongoing study of construction techniques and the relationship between prehistoric communities and their geological environment.
Carn Pen-y-Clogau is a scheduled monument protected by Cadw under reference CM257. View the official record →
Carn Pen-y-Clogau is a prehistoric round cairn located in Wales and protected by Cadw as a scheduled monument under reference CM257.
Carn Pen-y-Clogau 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.
Carn Pen-y-Clogau 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 CM257.
Several scheduled monuments lie within 10 km, including Banc Crucorford round cairn (5.4 km), Cwm Twrch settlement (6.1 km), Dorwen standing stone (7.1 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Carn Pen-y-Clogau'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.
Carn Pen-y-Clogau stands on Millstone Grit Group [See Also Migr], bedrock that formed in the Namurian. The rock here is mudstone, siltstone and sandstone.