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Latitude: 51.6116 / 51°36'41"N
Longitude: -3.3001 / 3°18'0"W
OS Eastings: 310070
OS Northings: 191111
OS Grid: ST100911
Mapcode National: GBR HS.9LM7
Mapcode Global: VH6DK.RR6D
Entry Name: Cross Ridge Dyke & Cairn on Twyn Hywel
Scheduled Date: 10 February 1994
Source ID: 2917
Cadw Legacy ID: GM456
Schedule Class: Defence
Category: Cross Ridge Dyke
County: Caerphilly (Caerffili)
Community: Aber Valley (Cwm Aber)
Traditional County: Glamorgan
The monument comprises a linear bank and ditch running across an upland ridge. The tradition of cross ridge dyke building appears to roughly span a millennium, beginning in the middle Bronze Age and lasting throughout the Iron Age (although perhaps with reuse and perhaps limited construction in the medieval period). They have been interpreted as territorial boundaries, defining areas of political influence (including internal territorial boundaries and land allotment within communities) and perhaps have ritual associations.
The dyke on Twyn Hywel runs 440m across moorland. There is a central gap - the western half running south-west by north-east and ends on a slope and marshy area. The eastern half, runs east-west and ends to the east on a natural slope. Thirty metres north of the eastern half of the dyke is a small cairn. The dyke ditch lies to the north with the bank to the south. It measures approx. 3.4m across overall by about 0.5m high.
The monument is of national importance for its potential to enhance our knowledge of prehistoric land division and perhaps ritual practices. The monument is an important relic of a prehistoric landscape and retains significant archaeological potential, with a strong probability of the presence of environmental and structural evidence.
The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.
Other nearby scheduled monuments