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.

Table 3    List of sites and geology
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