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Stepsau Duon is a medieval stepping stones crossing in Wales, protected by Cadw under reference GM185. The monument spans a watercourse where the underlying bedrock comprises Dinantian limestone with subordinate sandstone and argillaceous rocks, formed during the Mississippian period. This ancient geology would have presented both challenge and opportunity to medieval builders—the limestone capable of being worked into substantial stepping stones, whilst the watercourse itself likely posed a considerable crossing hazard to travellers and stock moving through the Welsh landscape.
The stepping stones represent a practical medieval solution to river crossing, constructed where the underlying rock formations provided suitable material and the watercourse allowed for stable placement. The substantial age of the bedrock demonstrates how medieval engineers worked within the constraints and resources offered by their local geology, selecting sites where natural stone could be fashioned into functional structures.
Today Stepsau Duon survives as a testament to medieval infrastructure and the enduring relationship between Welsh communities and their water crossings. The monument's preservation reflects its historical significance as a routeway structure, enabling the movement of people and animals across what would otherwise have been a difficult natural obstacle during the medieval period and beyond.
Stepsau Duon is a scheduled monument protected by Cadw under reference GM185. View the official record →
Stepsau Duon is a medieval stepping stones crossing in Wales, protected by Cadw under reference GM185.
Stepsau Duon dates from the medieval period, and is classified as a stepping stones. It is one of over 32,000 scheduled monuments protected across the UK.
Stepsau Duon 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 GM185.
Several scheduled monuments lie within 10 km, including Area of Shrunken Medieval Village (6.5 km), Nash Point Round Barrows (6.5 km), Nash Point Camp (7.2 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Stepsau Duon'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.
Stepsau Duon stands on Dinantian Rocks (Undifferentiated), bedrock that formed in the Mississippian. The rock here is limestone with subordinate sandstone and argillaceous rocks.