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Four Round Cairns on Mynydd-y-Glog is a prehistoric round cairn monument in Wales, protected by Cadw under reference GM522. The site comprises four distinct cairn structures positioned on moorland underlain by Millstone Grit Group bedrock, a sequence of mudstone, siltstone and sandstone deposited during the Namurian period. This geological foundation would have provided readily available stone for cairn construction, the harder sandstone layers fracturing naturally into suitable blocks for building.
Round cairns of this type typically date to the Bronze Age and served as burial monuments, often marking the graves of individuals of status within their communities. The grouping of four separate structures suggests either sequential use across generations or contemporary ritual significance within a single landscape. The upland setting on Mynydd-y-Glog is characteristic of Bronze Age burial practices, with exposed moorland chosen for its visibility across the surrounding terrain.
The monument survives today as four earthwork features whose structural integrity reflects the durability afforded by their stone construction in this well-drained upland location. The site forms part of the broader archaeological record of prehistoric activity across the Welsh moorlands, contributing to understanding of Bronze Age burial customs and settlement patterns in upland regions during the later prehistoric period.
Four Round Cairns on Mynydd-y-Glog is a scheduled monument protected by Cadw under reference GM522. View the official record →
Four Round Cairns on Mynydd-y-Glog is a prehistoric round cairn monument in Wales, protected by Cadw under reference GM522.
Four Round Cairns on 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.
Four Round Cairns on 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 GM522.
Several scheduled monuments lie within 10 km, including Tarren y Bwlch round cairn (6.1 km), Gadlys Ironworks (Remains of Blast Furnace) (6.4 km), Rhondda Fach Cairn (7.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Four Round Cairns on 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.
Four Round Cairns on 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.