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Tomen Garmon is a prehistoric mound located in Wales, standing upon bedrock composed of Caradoc Rocks, a formation of mudstone, siltstone and sandstone laid down during the Caradocian period. The monument is protected by Cadw, the Welsh heritage organisation, under the reference DE170. Such mounds, characteristic of prehistoric Wales, served various functions within their communities, ranging from ritual and ceremonial purposes to defensive positions or territorial markers.
The underlying geology of Caradoc Rocks would have significantly influenced settlement patterns in this area. These sedimentary deposits, formed in ancient marine environments, create soils and landscapes that shaped how prehistoric peoples exploited and inhabited this Welsh location. The stability of the bedrock would have provided a suitable foundation for the mound's construction and subsequent preservation over millennia.
Tomen Garmon represents an important element of Wales's prehistoric heritage. Its survival as an earthwork demonstrates the enduring nature of these monuments, which have remained visible features of the landscape despite thousands of years of agricultural and natural processes. The mound contributes to our understanding of prehistoric settlement, land use and social organisation across Wales.
Tomen Garmon is a scheduled monument protected by Cadw under reference DE170. View the official record →
Tomen Garmon is a prehistoric mound located in Wales, standing upon bedrock composed of Caradoc Rocks, a formation of mudstone, siltstone and sandstone laid down during the Caradocian period. It is designated a Scheduled Ancient Monument by Cadw under reference DE170.
Tomen Garmon dates from the prehistoric period, and is classified as a mound. It is one of over 32,000 scheduled monuments protected across the UK.
Tomen Garmon 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 DE170.
Several scheduled monuments lie within 10 km, including Y Garnedd Wen Round Cairn (2.8 km), Ysgwennant Barrow (3.9 km), Tomen Cefn Glaniwrch (7.5 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Tomen Garmon'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.
Tomen Garmon stands on Caradoc Rocks (Undifferentiated), bedrock that formed in the Caradocian. The rock here is mudstone, siltstone and sandstone.