© Mapbox · © OpenStreetMap contributors · Boundary data © Cadw
Siglem Las is a prehistoric round cairn comprising two conjoined circular mounds situated in Wales. The monument consists of stone heaps constructed over bedrock composed of Ordovician felsic tuff, a hard volcanic rock formed during the Ordovician period over 440 million years ago. This underlying geology of extrusive igneous material would have provided readily available stone for cairn construction, making the site's location practical for its builders.
Round cairns of this type typically date to the Bronze Age, though some may originate in the Neolithic. They functioned as burial monuments, with cremated or inhumed remains often deposited in central chambers or beneath the mound. The conjoined form of Siglem Las suggests either a dual burial purpose or successive phases of monument use and enlargement.
The site is now protected by Cadw, the Welsh heritage agency, under reference MG316, ensuring its preservation as an important record of prehistoric funerary practice and settlement patterns in Wales. The cairn remains a tangible link to Bronze Age communities who shaped the landscape according to their religious and social needs.
Siglem Las conjoined round cairns is a scheduled monument protected by Cadw under reference MG316. View the official record →
Siglem Las is a prehistoric round cairn comprising two conjoined circular mounds situated in Wales. It is designated a Scheduled Ancient Monument by Cadw under reference MG316.
Siglem Las conjoined round cairns 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.
Siglem Las conjoined round cairns 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 MG316.
Several scheduled monuments lie within 10 km, including Croes y Forwyn cairns (3.7 km), Clawdd Mawr (4.2 km), Cil Haul Barrow (4.6 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Siglem Las conjoined round cairns'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.
Siglem Las conjoined round cairns stands on Unnamed Extrusive Rocks, Ordovician, bedrock that formed in the Ordovician. The rock here is felsic tuff.