Ancient Monuments

History on the Ground

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Cors-y-Gedol Burial Chamber

A Scheduled Monument in Dyffryn Ardudwy, Gwynedd

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Latitude: 52.7848 / 52°47'5"N

Longitude: -4.0725 / 4°4'20"W

OS Eastings: 260325

OS Northings: 322819

OS Grid: SH603228

Mapcode National: GBR 5S.XM6S

Mapcode Global: WH56D.D8YF

Entry Name: Cors-y-Gedol Burial Chamber

Scheduled Date:

Source: Cadw

Source ID: 545

Cadw Legacy ID: ME038

Schedule Class: Religious, Ritual and Funerary

Category: Chambered long cairn

Period: Prehistoric

County: Gwynedd

Community: Dyffryn Ardudwy

Traditional County: Merionethshire


The monument consists of the remains of a chambered long cairn, dating to the early Neolithic (c. 4,200BC - 3,000BC). A long cairn is a roughly rectangular or trapezoidal mound of stone, usually between 25m and 120m long, with a length exceeding twice its greatest width. The mound may be edged with a timber or stone revetment, and they contain one or more stone or wooden burial chambers at one end.

The site consists of the remains of a rectangular stone cairn which is orientated west southwest to east northeast; it is 28m in length, 10m wide and up to 1m high at its centre. A megalithic burial chamber, possibly a portal dolmen, is positioned at the north eastern end of the cairn. The chamber consists of a capstone which is 3.6m in length and has a maximum width of 2.9m, resting on a single upright which is 1m in height at its north eastern end. The south eastern end of the capstone rests on the material of the cairn itself, a second upright stands to the north east of the first and at right angles to it.

The monument is of national importance for its potential to enhance our knowledge of prehistoric burial and ritual practices. The features are an important relic of a prehistoric funerary and ritual landscape and retain significant archaeological potential. There is a strong probability of the presence of both intact ritual and burial deposits, together with environmental and structural evidence. Chambered long cairns may be part of a larger cluster of monuments and their importance can be further enhanced by their group value.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Source: Cadw

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