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Tyle-mawr round cairn is a prehistoric round cairn situated in Wales and protected as a scheduled monument by Cadw under reference BR340. The monument sits upon bedrock formed from Lower Devonian rocks, a sequence of mudstone, siltstone and sandstone laid down in shallow marine environments during the Early Devonian period, some 400 million years ago. This geology has weathered to provide the stone resources naturally available to builders in the surrounding landscape.
Round cairns of this type were constructed during the Bronze Age as burial monuments, typically containing cremated remains or inhumations within stone chambers or cists. The form—a mound of piled stone—was well suited to the upland terrain and available geology of Wales. Such monuments served both as functional tombs and as prominent territorial markers across the Bronze Age landscape.
The site's survival to the present day, despite millennia of exposure to Welsh weather and agricultural use of the land, reflects the durability of stone construction. The monument remains an important record of prehistoric mortuary practices and settlement patterns, offering insight into how Bronze Age communities used and valued the Welsh uplands.
Tyle-mawr round cairn is a scheduled monument protected by Cadw under reference BR340. View the official record →
Tyle-mawr round cairn is a prehistoric round cairn situated in Wales and protected as a scheduled monument by Cadw under reference BR340.
Tyle-mawr round cairn dates from the prehistoric period, and is classified as a round cairn. It is one of over 32,000 scheduled monuments protected across the UK.
Tyle-mawr round cairn 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 BR340.
Several scheduled monuments lie within 10 km, including Garn Las ring cairn (5.6 km), Garn Las platform cairn (5.8 km), Waunewydd standing stone (5.9 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Tyle-mawr round cairn'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.
Tyle-mawr round cairn stands on Lower Devonian Rocks (Undifferentiated), bedrock that formed in the Early Devonian. The rock here is mudstone, siltstone and sandstone.