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Crugian Bach Enclosure is a prehistoric enclosure located in Wales and protected as a scheduled ancient monument under Cadw reference BR422. The site sits upon Ashgill Rocks, a geological formation of undifferentiated mudstone, siltstone and sandstone that dates to the Ashgill period. This underlying bedrock, composed of the fine sedimentary deposits characteristic of late Ordovician times, would have weathered to create the soil conditions present across the enclosure today.
The enclosure represents a significant example of prehistoric settlement and land division in Wales. Such enclosed sites typically served multiple functions—as defended settlements, livestock corrals, or ceremonial spaces—and reflect the social and economic organisation of their period. The specific location on Ashgill geology may have influenced both the practicality of construction and the choice of the site by prehistoric communities.
As a protected monument under Cadw's stewardship, Crugian Bach Enclosure remains an important record of Wales's prehistoric past. The site contributes to understanding the settlement patterns and land use practices of early farming and later prehistoric communities in the region, and the bedrock geology beneath continues to shape the monument's preservation and archaeological character.
Crugian Bach Enclosure is a scheduled monument protected by Cadw under reference BR422. View the official record →
Crugian Bach Enclosure is a prehistoric enclosure located in Wales and protected as a scheduled ancient monument under Cadw reference BR422.
Crugian Bach Enclosure dates from the prehistoric period, and is classified as a enclosure. It is one of over 32,000 scheduled monuments protected across the UK.
Crugian Bach Enclosure 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 BR422.
Several scheduled monuments lie within 10 km, including Gorllwyn round cairns (3.9 km), Carn Pantmaenllwyd cairn (4.3 km), Gurnos ring cairn (4.6 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Crugian Bach Enclosure'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.
Crugian Bach Enclosure stands on Ashgill Rocks (Undifferentiated), bedrock that formed in the Ashgill. The rock here is mudstone, siltstone and sandstone.