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Relict Seawall on Rumney Great Wharf is a post-medieval and modern defensive structure built to protect the Rumney estuary from tidal inundation and coastal erosion. The wharf lies in the Vale of Glamorgan, where the underlying bedrock comprises Middle Triassic claystone deposited during the Late Triassic period, interbedded with siltstone, sandstone and gypsum. This claystone geology has shaped both the site's vulnerability to erosion and the character of surrounding lands that required protection.
The seawall represents centuries of human management of the Welsh coast, where reclamation of productive agricultural land and industrial development necessitated substantial engineering works against the Bristol Channel tides. The wharf itself developed as a river port, with the seawall forming the critical boundary between settlement and water. The monument is protected by Cadw as part of the archaeological record of Wales's maritime heritage.
Today the relict seawall stands as evidence of changing land use and coastal management practices. Its construction, modification and eventual obsolescence reflect the economic and technological priorities of successive generations, from early modern port development through to modern industrial and residential expansion. The structure remains visible in the landscape as a testament to the ongoing relationship between settlement, commerce and the natural environment in south Wales.
Relict Seawall on Rumney Great Wharf is a scheduled monument protected by Cadw under reference GM474. View the official record →
Relict Seawall on Rumney Great Wharf is a post-medieval and modern defensive structure built to protect the Rumney estuary from tidal inundation and coastal erosion. It is designated a Scheduled Ancient Monument by Cadw under reference GM474.
Relict Seawall on Rumney Great Wharf dates from the post medieval/modern period, and is classified as a seawall. It is one of over 32,000 scheduled monuments protected across the UK.
Relict Seawall on Rumney Great Wharf 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 GM474.
Several scheduled monuments lie within 10 km, including Caer Castell Camp (2.6 km), St Mellons Churchyard Cross (3.5 km), Pen y lan Roman Site (3.9 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Relict Seawall on Rumney Great Wharf'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.
Relict Seawall on Rumney Great Wharf stands on Middle Triassic claystone, bedrock that formed in the Late Triassic. The rock here is major:{claystone}, Minor{siltstone,sandstone,gypsum}.