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Thornwell Farm Long Barrow is a prehistoric chambered monument sited on Dinantian limestone bedrock in Wales. The barrow represents a funerary structure of Neolithic date, constructed with stone quarried locally from the underlying carboniferous geology. Such monuments characterise the upland territories of Wales and the Welsh Borders, built to house the collective dead of early farming communities. The limestone and subordinate sandstone deposits on which it stands would have provided readily available building material for the chamber and its cairn covering.
The long barrow's orientation and architectural form reflect the funerary practices of Neolithic communities, with the chambered structure designed for successive interments. The site demonstrates the significant investment of labour required to extract, transport and position stone blocks across the limestone landscape, indicating both practical engineering skill and sustained social organisation within these early agricultural societies.
The monument is now protected by Cadw under reference MM206, ensuring its preservation as part of Wales's prehistoric heritage. A round barrow also survives at Thornwell Farm, representing a later Bronze Age addition to this significant funerary landscape. Together, these monuments document continuity of ritual and ceremonial practice across more than a millennium of prehistoric settlement and land use in the region.
Long Barrow and Round Barrow at Thornwell Farm is a scheduled monument protected by Cadw under reference MM206. View the official record →
Thornwell Farm Long Barrow is a prehistoric chambered monument sited on Dinantian limestone bedrock in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference MM206.
Long Barrow and Round Barrow at Thornwell Farm dates from the prehistoric period, and is classified as a chambered long barrow. It is one of over 32,000 scheduled monuments protected across the UK.
Long Barrow and Round Barrow at Thornwell Farm 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 MM206.
Several scheduled monuments lie within 10 km, including Heston Brake Long Barrow (4.5 km), Crick Medieval House (5.1 km), Portskewett Hill Roman Site (5.1 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Long Barrow and Round Barrow at Thornwell Farm'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.
Long Barrow and Round Barrow at Thornwell Farm stands on Dinantian Rocks (Undifferentiated), bedrock that formed in the Mississippian. The rock here is limestone with subordinate sandstone and argillaceous rocks.