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Nanna's Cave is a prehistoric cave situated in Wales and carved into Devonian claystone bedrock. The underlying geology of consolidated Carboniferous deposits, including sandstone, siltstone and carbonates, has created the conditions for cave formation in this region. The site is protected by Cadw, the Welsh heritage organisation, under reference PE425.
The claystone bedrock, formed during the Devonian period and subsequently buried beneath Carboniferous sediments, provides the stable geological foundation typical of Welsh cave systems. Such caves often contain evidence of occupation spanning thousands of years, from the earliest hunter-gatherers through to later prehistoric peoples who exploited the natural shelter offered by these limestone and claystone formations.
Nanna's Cave represents an important record of human activity in prehistoric Wales. Like other caves in the region, it would have served as a refuge and temporary or permanent dwelling for successive generations. The protected status of the site ensures that its archaeological potential and geological significance are preserved for future study and public understanding of Wales's deep human history.
Nanna's Cave is a scheduled monument protected by Cadw under reference PE425. View the official record →
Nanna's Cave is a prehistoric cave situated in Wales and carved into Devonian claystone bedrock. It is designated a Scheduled Ancient Monument by Cadw under reference PE425.
Nanna's Cave dates from the prehistoric period, and is classified as a cave. It is one of over 32,000 scheduled monuments protected across the UK.
Nanna's Cave 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 PE425.
Several scheduled monuments lie within 10 km, including Potter`s Cave (0.3 km), Daylight Rock Mesolithic Site (0.5 km), Fort St Catherine (3.4 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Nanna's Cave'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.
Nanna's Cave stands on Devonian claystone, bedrock that formed in the Carboniferous. The rock here is major:{claystone}, Minor{sandstone,siltstone,carbonates, consolidated}.