© Mapbox · © OpenStreetMap contributors · Boundary data © Cadw
Tyddyn Mawr is a prehistoric standing stone located in Wales and protected by Cadw under reference CN384. The monument stands on bedrock composed of Ordovician extrusive rocks, a geological foundation of felsic lava and tuff that formed nearly 450 million years ago during the Ordovician period. This ancient volcanic geology underlies much of the Welsh landscape and would have been well known to the Bronze Age and Neolithic peoples who erected standing stones across the region.
The stone itself represents a form of ritual or territorial marker common throughout prehistoric Britain and Ireland. Such monuments were typically erected during the Bronze Age, though some may be earlier, and often served ceremonial, burial-related or boundary functions within prehistoric communities. Tyddyn Mawr's survival to the present day, positioned to the south-southwest of its original settlement context, reflects the enduring nature of such monuments in the Welsh landscape.
The monument's protection under Cadw ensures its preservation as an important element of Wales's prehistoric heritage. Standing stones of this type provide tangible evidence of the social organisation, spiritual beliefs and landscape management practices of ancient Welsh communities, connecting modern visitors directly to thousands of years of human activity on these upland and moorland areas.
Tyddyn Mawr, standing stone to SSW of is a scheduled monument protected by Cadw under reference CN384. View the official record →
Tyddyn Mawr is a prehistoric standing stone located in Wales and protected by Cadw under reference CN384.
Tyddyn Mawr, standing stone to SSW of dates from the prehistoric period, and is classified as a standing stone. It is one of over 32,000 scheduled monuments protected across the UK.
Tyddyn Mawr, standing stone to SSW of 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 CN384.
Several scheduled monuments lie within 10 km, including Carn Pentyrch Camp (2.8 km), St Cybi's Well (3.2 km), Cross-Incised Stone in Llangybi Churchyard (3.3 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Tyddyn Mawr, standing stone to SSW of'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.
Tyddyn Mawr, standing stone to SSW of stands on Unnamed Extrusive Rocks, Ordovician, bedrock that formed in the Ordovician. The rock here is felsic lava and felsic tuff.