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Dyffryn Nedd is a prehistoric enclosure situated in Wales, occupying terrain underlain by bedrock of the Millstone Grit Group. This formation, dating from the Namurian period of the Carboniferous, comprises mudstone, siltstone and sandstone that shape the local landscape and drainage. The monument is protected by Cadw under reference BR188.
The enclosure belongs to a class of prehistoric monuments common across upland Britain, typically dating to the Bronze Age or Iron Age. Such sites often functioned as livestock corrals, habitation centres or seasonal camps, exploiting natural topography and available stone for construction. The Millstone Grit bedrock at Dyffryn Nedd would have provided natural outcrops and loose stone suitable for building earthworks and boundaries.
The monument's survival and protection reflect its archaeological significance as evidence of prehistoric settlement patterns and land use in this region. The site's location within the Welsh uplands places it within a broader distribution of enclosures that characterise Bronze and Iron Age occupation of such terrain. Dyffryn Nedd contributes to understanding how prehistoric communities adapted to and utilised the geological and topographical resources of their environment.
Dyffryn Nedd is a scheduled monument protected by Cadw under reference BR188. View the official record →
Dyffryn Nedd is a prehistoric enclosure situated in Wales, occupying terrain underlain by bedrock of the Millstone Grit Group. It is designated a Scheduled Ancient Monument by Cadw under reference BR188.
Dyffryn Nedd dates from the prehistoric period, and is classified as a enclosure. It is one of over 32,000 scheduled monuments protected across the UK.
Dyffryn Nedd 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 BR188.
Several scheduled monuments lie within 10 km, including Glynneath Gunpowder Works (4.5 km), Craig y Ddinas Hillfort (4.7 km), Dinas Silica Mine (4.7 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Dyffryn Nedd'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.
Dyffryn Nedd stands on Millstone Grit Group [See Also Migr], bedrock that formed in the Namurian. The rock here is mudstone, siltstone and sandstone.