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Cefn Cribwr Ironworks is a post-medieval and modern industrial monument located in Wales, protected by Cadw under reference GM417. The site exploits the rich mineral resources of the underlying geology, which comprises the Pennine Lower Coal Measures Formation and South Wales Lower Coal Measures Formation. These Westphalian-age rocks, formed in an ancient tropical delta environment, contain the mudstones, siltstones and sandstones interbedded with workable seams of coal and ironstone that made this location economically significant for iron production.
The ferricrete deposits present in the bedrock—oxidised iron-rich layers formed by natural weathering processes—would have provided additional iron ore resources accessible to nineteenth and twentieth-century ironworkers. The combination of coal for fuel and iron ore in close proximity made the South Wales valleys particularly attractive for industrial development during the age of heavy industry.
Cefn Cribwr Ironworks represents the archaeological evidence of Wales's industrial heritage, reflecting the integration of local geology with technological innovation. The site's survival as a protected monument preserves the physical record of ironworking practices and industrial organisation in the modern period, documenting a crucial phase in Welsh economic and social history.
Cefn Cribwr Ironworks is a scheduled monument protected by Cadw under reference GM417. View the official record →
Cefn Cribwr Ironworks is a post-medieval and modern industrial monument located in Wales, protected by Cadw under reference GM417.
Cefn Cribwr Ironworks dates from the post medieval/modern period, and is classified as a ironworks. It is one of over 32,000 scheduled monuments protected across the UK.
Cefn Cribwr Ironworks 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 GM417.
Several scheduled monuments lie within 10 km, including Merthyr Mawr Warren (6.5 km), Candleston Castle (6.5 km), Merthyr Mawr Churchyard Cross (6.7 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Cefn Cribwr Ironworks'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.
Cefn Cribwr Ironworks stands on Pennine Lower Coal Measures Formation And South Wales Lower Coal Measures Formation (Undifferentiated), bedrock that formed in the Westphalian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.