Coed-y-Darren

Site of Special Scientific Interest · 51.6225, -3.0997

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Gwent County

Geology & landscape

Geological Period: Carboniferous

Landscape processes: Glacial

Description

Description This landslip back-scar exposes a sequence of about 30 metres of middle Westphalian (Carboniferous) strata. It complements the section seen at Wern Ddu Claypit near Caerphilly extending the sequence up into the Rhondda Beds, and together the two sites provide a unique opportunity to observe the condensed succession in the eastern part of the coalfield. The section here shows both Cefn Coed and the Upper Cwm Gorse Marine Banks, two of the most important Middle Westphalian marker horizons, which allow easy correlation with the main part of the coalfield. A critical site for understanding the geological evolution of the South Wales basin.