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Slate Gwaliau at Felin Fawr, Penrhyn is a post-medieval and modern wall that reflects the industrial heritage of North Wales. The monument stands on bedrock composed of Lower Cambrian rocks, a sequence of mudstone, siltstone and sandstone laid down during the Early Cambrian period over 500 million years ago. This geology would later become economically significant when the slate industries of the region developed.
The wall itself represents the practical use of local slate in construction, a material historically quarried extensively in the surrounding landscape. As a vernacular structure, it embodies the building traditions and land use patterns of post-medieval and modern Wales, where slate served as both roofing material and structural element across domestic and agricultural buildings. The monument's name references the slate—gwaliau meaning "walls" in Welsh—indicating its local significance.
The site is protected by Cadw, the Welsh Historic Monuments service, under reference CN297, recognising its value as part of the broader architectural and cultural record of the region. Its survival demonstrates the durability of slate construction and the longstanding relationship between Wales's distinctive geology and its building heritage.
Slate Gwaliau at Felin Fawr, Penrhyn is a scheduled monument protected by Cadw under reference CN297. View the official record →
Slate Gwaliau at Felin Fawr, Penrhyn is a post-medieval and modern wall that reflects the industrial heritage of North Wales. It is designated a Scheduled Ancient Monument by Cadw under reference CN297.
Slate Gwaliau at Felin Fawr, Penrhyn dates from the post medieval/modern period, and is classified as a wall. It is one of over 32,000 scheduled monuments protected across the UK.
Slate Gwaliau at Felin Fawr, Penrhyn 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 CN297.
Several scheduled monuments lie within 10 km, including Carnedd Fach cairn (5.7 km), Dinorwic Quarry (6.2 km), Vivian Slate Quarry, Inclines, Walia & associated structures (6.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Slate Gwaliau at Felin Fawr, Penrhyn'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.
Slate Gwaliau at Felin Fawr, Penrhyn stands on Lower Cambrian Rocks (Undifferentiated), bedrock that formed in the Early Cambrian. The rock here is mudstone, siltstone and sandstone.