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Wat's Dyke: Section NW of Clawdd Offa is an early medieval linear earthwork that runs through Wales, one of two major frontier works constructed during the early Anglo-Saxon period. The dyke follows the natural contours of the landscape, where Millstone Grit bedrock—comprising layers of sandstone, siltstone and mudstone formed in the Namurian period—creates varied topography that the builders exploited to maximise the earthwork's defensive potential. This substantial bank and ditch system represents a significant investment of labour and engineering knowledge, designed to control movement and define territorial boundaries in the Welsh Marches region during the early medieval centuries.
The monument's survival reflects both the solidity of its original construction and the stable geological conditions of the Millstone Grit substrate, which provided firm foundations resistant to erosion. The section here has been recognised as a heritage asset of sufficient importance to warrant protection by Cadw, the historic monuments service of Wales, reflecting its archaeological and landscape significance.
Wat's Dyke remains one of Britain's most important early medieval monuments, offering tangible evidence of the political organisation and frontier management strategies of the period.
Wat's Dyke: Section NW of Clawdd Offa is a scheduled monument protected by Cadw under reference FL090. View the official record →
Wat's Dyke: Section NW of Clawdd Offa is an early medieval linear earthwork that runs through Wales, one of two major frontier works constructed during the early Anglo-Saxon period. It is designated a Scheduled Ancient Monument by Cadw under reference FL090.
Wat's Dyke: Section NW of Clawdd Offa dates from the early medieval period, and is classified as a linear earthwork. It is one of over 32,000 scheduled monuments protected across the UK.
Wat's Dyke: Section NW of Clawdd Offa 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 FL090.
Several scheduled monuments lie within 10 km, including Offa's Dyke Section South of River Gwenfro (8.9 km), Offa's Dyke: North Section at Coedpoeth (9.2 km), Gatewen Hall round barrow (9.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Wat's Dyke: Section NW of Clawdd Offa'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.
Wat's Dyke: Section NW of Clawdd Offa stands on Millstone Grit Group [See Also Migr], bedrock that formed in the Namurian. The rock here is mudstone, siltstone and sandstone.