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Two Round Cairns on the Summit of Mynydd-y-Glog is a prehistoric round cairn located in Wales and protected by Cadw under reference GM526. Round cairns of this type date broadly to the Bronze Age and typically served as burial monuments, constructed from stone gathered locally and heaped into distinctive circular mounds. The summit location of this monument would have offered prominent visibility across the surrounding landscape, a characteristic feature of cairn placement during prehistory.
The site rests upon bedrock of the Millstone Grit Group, a formation of mudstone, siltstone and sandstone dating to the Namurian period. This geology would have provided readily available stone for cairn construction, with suitable materials naturally exposed or easily extracted from the upland terrain. The hard, stratified nature of millstone grit makes it suitable for stone monument building, and its presence at this elevation shaped both the practicality and appearance of the cairn structure.
The survival of two distinct cairns at this location indicates a significant prehistoric focus on this high ground. Multiple cairn groups often represent repeated use of a burial location across generations or separate phases of monument construction. The prominence of Mynydd-y-Glog's summit would have made it a natural gathering point and memorial landscape for Bronze Age communities, with the visible cairns serving as enduring markers in the upland environment.
Two Round Cairns on the Summit of Mynydd-y-Glog is a scheduled monument protected by Cadw under reference GM526. View the official record →
Two Round Cairns on the Summit of Mynydd-y-Glog is a prehistoric round cairn located in Wales and protected by Cadw under reference GM526.
Two Round Cairns on the Summit of Mynydd-y-Glog 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.
Two Round Cairns on the Summit of Mynydd-y-Glog 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 GM526.
Several scheduled monuments lie within 10 km, including Tarren y Bwlch round cairn (6 km), Gadlys Ironworks (Remains of Blast Furnace) (6.2 km), Rhondda Fach Cairn (7.1 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Two Round Cairns on the Summit of Mynydd-y-Glog'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.
Two Round Cairns on the Summit of Mynydd-y-Glog stands on Millstone Grit Group [See Also Migr], bedrock that formed in the Namurian. The rock here is mudstone, siltstone and sandstone.