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Dyke 315m E of Tyla-Glas is a prehistoric linear earthwork situated in Wales on bedrock of the South Wales Upper Coal Measures Formation. The underlying geology comprises mudstone, siltstone and sandstone interspersed with coal seams and ironstone, topped by ferricrete—a hard iron-rich crust formed during the Westphalian period. This substantial mineral deposit would have influenced patterns of settlement and land use throughout prehistory and later periods.
The dyke represents an important class of prehistoric monument, typically constructed to demarcate territorial boundaries, control livestock movement, or define defended settlements. Linear earthworks of this type often reveal considerable effort invested in landscape organisation during Bronze Age or Iron Age periods, though precise dating requires archaeological investigation.
The monument is protected by Cadw, Wales's historic monuments service, under the reference GM260, recognising its archaeological significance and contribution to understanding prehistoric land management in the region. The specific topography created by the underlying coal measures geology would have shaped the dyke's route and construction.
Dyke 315m E of Tyla-Glas is a scheduled monument protected by Cadw under reference GM260. View the official record →
Dyke 315m E of Tyla-Glas is a prehistoric linear earthwork situated in Wales on bedrock of the South Wales Upper Coal Measures Formation. It is designated a Scheduled Ancient Monument by Cadw under reference GM260.
Dyke 315m E of Tyla-Glas dates from the prehistoric period, and is classified as a dyke. It is one of over 32,000 scheduled monuments protected across the UK.
Dyke 315m E of Tyla-Glas 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 GM260.
Several scheduled monuments lie within 10 km, including Tir Lan round barrow cemetery (2.6 km), Maen Cattwg (cup-marked stone) (4.2 km), Gelligaer Roman Site (4.8 km).
This page is just one thread. A full Aubrey report pulls together 13 strands of Dyke 315m E of Tyla-Glas'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.
Dyke 315m E of Tyla-Glas stands on South Wales Upper Coal Measures Formation, bedrock that formed in the Westphalian. The rock here is mudstone, siltstone, sandstone, coal, ironstone and ferricrete.