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Garnbwll Limekiln is a post-medieval limekiln located in Wales, protected by Cadw under reference CM278. The structure was built to exploit the substantial limestone deposits of the Dinantian age that underlie this part of Wales. These ancient rocks, formed during the Mississippian period over 300 million years ago, consist primarily of limestone interspersed with sandstone and argillaceous layers, providing an ideal raw material for lime production.
Limekilns such as this were essential industrial structures from the medieval period onwards, converting limestone into quicklime through intense heat. The quicklime produced was used in agriculture as a soil amendment, in mortar for building, and in various manufacturing processes. The location of Garnbwll Limekiln directly above the Dinantian limestone deposits made it economically viable, allowing operators to minimise transport of the heavy raw material.
The kiln represents an important phase of Welsh industrial heritage, demonstrating how local geology shaped economic activity. Such structures remain significant archaeological records of pre-industrial and early industrial lime production, which was widely distributed across limestone-bearing regions of Britain where local demand or water transport made the enterprise profitable.
Garnbwll Limekiln is a scheduled monument protected by Cadw under reference CM278. View the official record →
Garnbwll Limekiln is a post-medieval limekiln located in Wales, protected by Cadw under reference CM278.
Garnbwll Limekiln dates from the post medieval/modern period, and is classified as a limekiln. It is one of over 32,000 scheduled monuments protected across the UK.
Garnbwll Limekiln 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 CM278.
Several scheduled monuments lie within 10 km, including Mynydd Llangyndeyrn Burial Chamber (1.5 km), Mynydd Llangyndeyrn Round Cairns (2.1 km), Standing Stone NE of Halfway House (5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Garnbwll Limekiln'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.
Garnbwll Limekiln stands on Dinantian Rocks (Undifferentiated), bedrock that formed in the Mississippian. The rock here is limestone with subordinate sandstone and argillaceous rocks.