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Crug Glas Round Barrow is a prehistoric earthwork monument located in Wales and protected by Cadw under reference CM091. The barrow sits upon bedrock of Ashgill formation rocks—a sequence of mudstone, siltstone and sandstone laid down in the Ashgill period of the Ordovician epoch. This solid geological foundation would have provided a stable base for the monument's construction, whilst the softer surrounding sedimentary rocks shaped the character of the local landscape in which it was built.
Round barrows of this type typically served as burial monuments, constructed by prehistoric communities to mark the graves of significant individuals or groups. The Ashgill bedrock exposed across the site would have offered stone suitable for use within the barrow's structure, though the precise configuration and internal chambers of Crug Glas remain matters of archaeological record.
As a scheduled monument under Cadw's protection, the barrow is recognised as a surviving example of prehistoric funerary practice in Wales. Its preservation enables continued study of burial customs, settlement patterns and land use during the Bronze Age and earlier periods when such monuments were raised across the Welsh uplands and lowlands alike.
Crug Glas Round Barrow is a scheduled monument protected by Cadw under reference CM091. View the official record →
Crug Glas Round Barrow is a prehistoric earthwork monument located in Wales and protected by Cadw under reference CM091.
Crug Glas Round Barrow dates from the prehistoric period, and is classified as a round barrow. It is one of over 32,000 scheduled monuments protected across the UK.
Crug Glas Round Barrow 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 CM091.
Several scheduled monuments lie within 10 km, including Crug Ieuan Round Barrow (1.5 km), Garreg Wen Standing Stone (3.4 km), Capel Bettws (3.8 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Crug Glas Round Barrow'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.
Crug Glas Round Barrow stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.