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Pen-llys Earthwork is a prehistoric enclosure situated in Wales, protected as a scheduled ancient monument by Cadw under reference BR096. The site occupies ground underlain by Ashgill Rocks, an undifferentiated sequence of mudstone, siltstone and sandstone formations from the Ashgill period, which provides a naturally stable but moisture-retaining foundation typical of upland Welsh terrain.
The earthwork comprises a roughly circular or oval enclosure defined by a substantial bank and ditch, a characteristic design from the Neolithic or Bronze Age periods of prehistoric Britain. Such enclosures served multiple functions, including stock containment, settlement occupation and ceremonial or defensive purposes. The precise date and specific use of this particular example remain to be fully determined by archaeological investigation.
The site's location on Ashgill bedrock would have offered both advantages and constraints to its prehistoric builders. The underlying geology ensured adequate drainage across slopes whilst the soft sedimentary rock allowed for the cutting of ditches without requiring hard stone tools. The earthwork survives today as a visible earthen monument, testament to the substantial labour investment made by its creators over two millennia ago.
Pen-llys Earthwork is a scheduled monument protected by Cadw under reference BR096. View the official record →
Pen-llys Earthwork is a prehistoric enclosure situated in Wales, protected as a scheduled ancient monument by Cadw under reference BR096.
Pen-llys Earthwork dates from the prehistoric period, and is classified as a enclosure. It is one of over 32,000 scheduled monuments protected across the UK.
Pen-llys Earthwork 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 BR096.
Several scheduled monuments lie within 10 km, including Standing Stone SSE of Dol-y-Felin (4 km), Earthworks SW of Church (4.2 km), Roman Fortlet (revealed by aerial photography), Disserth (4.6 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Pen-llys Earthwork'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.
Pen-llys Earthwork stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.