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Dinas Dinlle Seagull Trench is a modern seagull trench located in Wales. The site sits upon bedrock of Llanvirn Rocks, an undifferentiated formation of mudstone, siltstone and sandstone dating to the Whiterock period. This geological foundation reflects the varied sedimentary deposits typical of the Ordovician seas that once covered this region, creating a complex stratigraphy of fine-grained and medium-grained clastic rocks.
The seagull trench represents a functional feature within the broader landscape, where the underlying geology influences both the site's drainage and the character of surface deposits. The Whiterock-age rocks provide a relatively stable base, though their mudstone component can become unstable when exposed to weathering and water movement.
The monument is protected by Cadw under reference CN396, recognising its place within Wales's archaeological and geological heritage. The site's preservation reflects the importance of understanding how human activity, wildlife behaviour and natural geology interact across the Welsh landscape.
Dinas Dinlle Seagull Trench is a scheduled monument protected by Cadw under reference CN396. View the official record →
Dinas Dinlle Seagull Trench is a modern seagull trench located in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference CN396.
Dinas Dinlle Seagull Trench dates from the modern period, and is classified as a seagull trench. It is one of over 32,000 scheduled monuments protected across the UK.
Dinas Dinlle Seagull Trench 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 CN396.
Several scheduled monuments lie within 10 km, including Penarth Burial Chamber (5.5 km), Y Foel Camp (6 km), Cross Inscribed Stone Near Capel Uchaf (6.7 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Dinas Dinlle Seagull Trench'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.
Dinas Dinlle Seagull Trench stands on Llanvirn Rocks (Undifferentiated), bedrock that formed in the Whiterock. The rock here is mudstone, siltstone and sandstone.