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Latitude: 52.3747 / 52°22'28"N
Longitude: -3.6455 / 3°38'43"W
OS Eastings: 288075
OS Northings: 276454
OS Grid: SN880764
Mapcode National: GBR 9B.RK2W
Mapcode Global: VH5C7.RKMY
Entry Name: Carn y Groes cairn
Scheduled Date: 20 January 2004
Source ID: 4089
Cadw Legacy ID: RD208
Schedule Class: Religious, Ritual and Funerary
Category: Round cairn
Community: Rhayader (Rhaeadr Gwy)
Traditional County: Montgomeryshire
The monument comprises the remains of a burial cairn, probably dating to the Bronze Age (c.2300 BC - 800 BC) and situated within enclosed moorland on the summit of the ridge at the head of Nant y Derrol. The grass-covered stone built cairn is circular on plan and measures about 9.5m in diameter and up to 0.7m in height. A large modern cairn has been raised on its SE side.
The monument is of national importance for its potential to enhance our knowledge of prehistoric burial and ritual. The monument is an important relic of a prehistoric funerary and ritual landscape and retains significant archaeological potential, with a strong probability of the presence of both intact burial or ritual deposits and environmental and structural evidence, including a buried prehistoric land surface.
The area scheduled comprises the remains described and an area around them within which related evidence may be expected to survive. It is circular and measures 25m in diameter.