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Penclawdd Sea Dock and Canal is a post-medieval and modern dockyard located in Wales, protected by Cadw under reference GM398. The site developed upon bedrock of the South Wales Upper Coal Measures Formation, a Westphalian sequence of mudstone, siltstone and sandstone interspersed with coal seams, ironstone and ferricrete. This geology directly shaped the dock's purpose and prosperity, as the underlying coalfield resources drove industrial expansion across south Wales during the eighteenth and nineteenth centuries.
The dock and canal represent the maritime infrastructure necessary to export coal and other mineral products from the Welsh interior to wider markets. The construction of such facilities required substantial engineering work to manage the challenging coastal terrain and tidal conditions of the Welsh coast. The ferricrete deposits within the local bedrock would have been exploited alongside coal extraction, adding to the site's industrial significance.
Today, the remains preserve evidence of the technological and commercial systems that sustained Wales's industrial economy. The dock's layout and surviving structures demonstrate how communities adapted engineering solutions to local geology and geography. As a protected monument, Penclawdd Sea Dock and Canal contributes to understanding post-medieval industrial heritage and the relationship between natural resources and settlement development in south Wales.
Penclawdd Sea Dock and Canal is a scheduled monument protected by Cadw under reference GM398. View the official record →
Penclawdd Sea Dock and Canal is a post-medieval and modern dockyard located in Wales, protected by Cadw under reference GM398.
Penclawdd Sea Dock and Canal dates from the post medieval/modern period, and is classified as a dockyard. It is one of over 32,000 scheduled monuments protected across the UK.
Penclawdd Sea Dock and Canal 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 GM398.
Several scheduled monuments lie within 10 km, including Penmaen Burrows Church (8.1 km), Penmaen Burrows Burial Chamber (8.1 km), Penmaen Burrows Ringwork (8.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Penclawdd Sea Dock and Canal'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.
Penclawdd Sea Dock and Canal stands on South Wales Upper Coal Measures Formation, bedrock that formed in the Westphalian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.