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Kilvey Hill Earthwork is a prehistoric enclosure situated on high ground in South Wales. The monument consists of a substantial bank-and-ditch system that encloses an area on the hilltop, typical of defended settlements constructed during the Bronze Age or Iron Age. The earthwork's commanding position would have offered strategic advantage and extensive views across the surrounding landscape, factors that commonly influenced the siting of such enclosures in prehistoric Wales.
The enclosure is constructed directly upon bedrock of the South Wales Upper Coal Measures Formation, composed of mudstone, siltstone and sandstone interspersed with coal and ironstone deposits. This geology, formed during the Westphalian period of the Carboniferous era, creates a naturally elevated and robust foundation for the monument. The ferricrete elements within the geological sequence may have provided suitable stone material for the construction or reinforcement of the earthwork's defences.
The site is protected by Cadw under the reference GM315, recognising its significance as a prehistoric monument. The earthwork remains a valuable record of Iron Age or Bronze Age settlement patterns in the region, preserving evidence of how communities utilised hilltop positions for habitation and defence during the pre-Roman period.
Earthwork on Kilvey Hill is a scheduled monument protected by Cadw under reference GM315. View the official record →
Kilvey Hill Earthwork is a prehistoric enclosure situated on high ground in South Wales. It is designated a Scheduled Ancient Monument by Cadw under reference GM315.
Earthwork on Kilvey Hill dates from the prehistoric period, and is classified as a enclosure. It is one of over 32,000 scheduled monuments protected across the UK.
Earthwork on Kilvey Hill 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 GM315.
Several scheduled monuments lie within 10 km, including Tir-Gwyllt Second World War Barrage Balloon Site (0.9 km), White Rock Copper Works (0.9 km), Foxhole River Staithes (1.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Earthwork on Kilvey Hill'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.
Earthwork on Kilvey Hill 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.