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Offa's Dyke: Chirk Park Section extending NE from the Lake is an early medieval linear earthwork in Wales, forming part of the most substantial Anglo-Saxon frontier construction of the 8th century. This northern segment of the dyke extends northeast from the lake at Chirk Park, cutting across undulating terrain where Millstone Grit Group bedrock—comprising mudstone, siltstone and sandstone laid down during the Namurian period—lies beneath the surface. The engineering challenge of driving such a massive earthwork across varied geology demonstrates the considerable resources and organisation deployed in its construction.
The dyke's visible form at this location reflects both the original design and subsequent landscape change. Where it descends across the park, the earthwork's profile adapts to the underlying terrain, with the builders utilising the natural contours to maximise defensive effect. The Millstone Grit bedrock, harder than overlying soils, would have required careful planning to achieve the consistent cutting and banking evident along the dyke's length.
This section of Offa's Dyke remains a substantial upstanding monument, protected by Cadw as a nationally significant archaeological site under reference DE135. It represents a crucial physical boundary in the medieval Welsh-English frontier zone.
Offa's Dyke: Chirk Park Section extending NE from the Lake is a scheduled monument protected by Cadw under reference DE135. View the official record →
Offa's Dyke: Chirk Park Section extending NE from the Lake is an early medieval linear earthwork in Wales, forming part of the most substantial Anglo-Saxon frontier construction of the 8th century. It is designated a Scheduled Ancient Monument by Cadw under reference DE135.
Offa's Dyke: Chirk Park Section extending NE from the Lake 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.
Offa's Dyke: Chirk Park Section extending NE from the Lake 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 DE135.
Several scheduled monuments lie within 10 km, including Offa's Dyke: section 250yds (230m) long, S of Careg-y-Big (7.2 km), Offa's Dyke: section 550yds (500m) long, on Bakers Hill (7.6 km), Castell Brogyntyn ringwork castle 300m north east of Brogyntyn Farm (7.6 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Offa's Dyke: Chirk Park Section extending NE from the Lake'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.
Offa's Dyke: Chirk Park Section extending NE from the Lake stands on Millstone Grit Group [See Also Migr], bedrock that formed in the Namurian. The rock here is mudstone, siltstone and sandstone.