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Earthwork 360m NNE of Crug yr Avan is a prehistoric enclosure situated on the Coal Measures bedrock of South Wales. The site rests upon strata of the Upper Coal Measures Formation, where mudstone, siltstone and sandstone underlie the surface, interspersed with coal and ironstone deposits typical of the Westphalian period. This geological foundation has shaped both the landscape and the character of occupation in the area since prehistoric times.
The enclosure represents a form of settlement or defensive structure common to prehistoric Wales, defined by earthen banks and ditches that would have enclosed an area for habitation, stock management or ritual purposes. The surviving earthwork remains visible in the modern topography despite weathering and land use changes over millennia.
The monument is protected as a scheduled ancient monument by Cadw, the Welsh heritage organisation, under the reference GM278, reflecting its archaeological significance and the importance of preserving evidence of prehistoric settlement patterns across South Wales. Such enclosures contribute substantially to understanding the organisation of communities during the Bronze Age and Iron Age in the region.
Earthwork 360m NNE of Crug yr Avan is a scheduled monument protected by Cadw under reference GM278. View the official record →
Earthwork 360m NNE of Crug yr Avan is a prehistoric enclosure situated on the Coal Measures bedrock of South Wales. It is designated a Scheduled Ancient Monument by Cadw under reference GM278.
Earthwork 360m NNE of Crug yr Avan 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 360m NNE of Crug yr Avan 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 GM278.
Several scheduled monuments lie within 10 km, including Carn y Hyrddod & Neighbouring Cairn (2.4 km), Mynydd Ton Cairns (3.2 km), Mynydd Caerau Round Cairns (3.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Earthwork 360m NNE of Crug yr Avan'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 360m NNE of Crug yr Avan 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.