OR/14/043 Site descriptions
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Farr, G, Graham, J, and Stratford, C. 2014. Survey, characterisation and condition assessment of Palustriella dominated springs 'H7220 Petrifying springs with tufa formation (Cratoneurion)' in Wales. British Geological Survey Internal Report, OR/14/043. |
A list of potential sites (see below) was provided by NRW based on the occurrence of Palustriella dominated vegetation, the presence of tufa or NVC M37 community, a vegetation type known to occur widely in Wales based on preliminary NRW surveys. Descriptions of the sites are provided in the following sub chapters.
Site | 1:50K Geology | Tufa forming? |
Foel Fawr Site 1 | Carboniferous Limestone — Dowlais Limestone Formation | Yes |
Foel Fawr Site 2 | Carboniferous Limestone — Dowlais Limestone Formation | Yes |
Foel Fawr: Moel Gornach | Carboniferous Limestone — Dowlais Limestone Formation | v.small area |
Carboniferous Limestone — Dowlais Limestone Formation | Yes | |
Pont Clydach | Lower Devonian Old Red Sandstone — Brownstones Formation | No |
Blaen Onnen | Carboniferous Limestone — Abercriban Oolite Subgroup | Yes |
Llyn y Fan Fach | Lower Devonian Old Red Sandstone — Brownstones Formation underlain by the Lower Devonian Senni Formation | v.small on one plant |
Cwm Clydach | Carboniferous Limestone — Castell Coch Limestone formation | Yes |
Waun Ddu/Craig y Cilau | Carboniferous Limestone sequence (Pembroke and Avon Group) overlying Devonian Qtz conglomerate and brownstones | No |
Tarren y Esgob | Lower Devonian Old Red Sandstone, Senni Formation calcrete horizon | Yes |
Hen Allt Common | Devonian Raglan Mudstone Formation calcrete horizon | Yes |
Cors Erdderiniog | Junction of Carboniferous Clwyd Limestone Group overlying the Lligwy Sandstone | Yes |
Fedw Fawr Beach | Carboniferous Clwyd Limestone Group Loggerheads Limestone formation (includes sandstone in cliff section) | Yes |
Ddol Uchaf | Quaternary Tufa Deposit underlain by Silurian Elwy formation | Yes |
Mc Walters Dingle | Carboniferous Pennine Lower Coal Measures Formation | Yes |
Nant Peris | Ordovician Snowdon Volcanic Group | No |