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Trefil Quarries North is a post-medieval and modern quarry in Wales, protected by Cadw under reference MM338. The site exploits the Dinantian limestone formations that underlie the landscape, rocks laid down during the Mississippian period and comprising limestone with subordinate bands of sandstone and argillaceous material. Quarrying in the Trefil area developed significantly during the post-medieval period as demand grew for building stone and lime production, with the quarry workings expanding into the modern era to supply regional and wider markets.
The quarry's operations have shaped the local topography and geology, with extraction following the natural stratification of the Dinantian sequence. The exposed rock faces and quarry floors reveal the layered nature of the Mississippian deposits, demonstrating both the resource that drove economic activity and the industrial methods employed across successive periods. The site represents the landscape-scale impact of limestone quarrying in upland Wales, where such extraction has been fundamental to local economies and settlement patterns from the early modern period onwards.
Trefil Quarries North is a scheduled monument protected by Cadw under reference MM338. View the official record →
Trefil Quarries North is a post-medieval and modern quarry in Wales, protected by Cadw under reference MM338.
Trefil Quarries North dates from the post medieval/modern period, and is classified as a quarry. It is one of over 32,000 scheduled monuments protected across the UK.
Trefil Quarries North 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 MM338.
Several scheduled monuments lie within 10 km, including Afon Sirhowy hut circle (2.1 km), Sirhowy Ironworks, Site of (4.7 km), Rhymney Upper Furnace (5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Trefil Quarries North'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.
Trefil Quarries North stands on Dinantian Rocks (Undifferentiated), bedrock that formed in the Mississippian. The rock here is limestone with subordinate sandstone and argillaceous rocks.