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Pen y Bryn / Cloddfa'r Lôn is a water-driven pump system associated with an industrial quarry in Wales, protected by Cadw as a scheduled monument under reference CN418. The site exploits the Lower Cambrian bedrock that underlies it, a sequence of mudstone, siltstone and sandstone laid down during the Early Cambrian period. These relatively soft sedimentary rocks made the quarry economically viable for extraction.
The water-driven pump represents an important phase in Welsh quarrying technology, harnessing the momentum and power of flowing water to remove groundwater from the working quarry face. This mechanical innovation allowed quarrying operations to penetrate deeper and remain productive even in wet conditions, a common challenge in the Welsh uplands where rainfall and groundwater are abundant.
The monument survives as evidence of industrial-era quarrying practices and the engineering solutions developed to overcome the hydrogeological constraints of working in Lower Cambrian strata. Its protected status recognises the archaeological and industrial heritage value of the site, preserving the physical remains of Wales's quarrying economy and the technological adaptation required to exploit difficult geology.
Pen y Bryn / Cloddfa’r Lôn water-driven pump system is a scheduled monument protected by Cadw under reference CN418. View the official record →
Pen y Bryn / Cloddfa'r Lôn is a water-driven pump system associated with an industrial quarry in Wales, protected by Cadw as a scheduled monument under reference CN418.
Pen y Bryn / Cloddfa’r Lôn water-driven pump system dates from the industrial period, and is classified as a quarry. It is one of over 32,000 scheduled monuments protected across the UK.
Pen y Bryn / Cloddfa’r Lôn water-driven pump system 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 CN418.
Several scheduled monuments lie within 10 km, including Hut Circle Settlement Above Gilfach (6.5 km), Cwm Llefrith cairn (7.7 km), Llystyn Gwyn Inscribed Stone (8.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Pen y Bryn / Cloddfa’r Lôn water-driven pump system'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.
Pen y Bryn / Cloddfa’r Lôn water-driven pump system stands on Lower Cambrian Rocks (Undifferentiated), bedrock that formed in the Early Cambrian. The rock here is mudstone, siltstone and sandstone.