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Table 12: Pollen zones for Braich y Gornel
Zone BYG 1 100–67cm
Alnus – Corylus avellana type – Poaceae
The zone is characterised by relatively high arboreal pollen, largely Alnus and Corylus avellana type. Quercus values are low and other arboreal taxa occasional. Poaceae pollen is frequent. Herbaceous taxa include Plantago lanceolata, Potentilla type, Ranunculus type and Succisa. Charcoal concentrations peak twice.
Zone BYG2 67–46cm
Poaceae
A sharp fall in arboreal pollen and increase in Poaceae pollen and other herb taxa, notably Plantago lanceolata, Potentilla type and Filipendula. Calluna values increase slightly. Sphagnum spores increase. Occasional aquatic taxa are present. Charcoal concentration values are high.
Zone BYG3 46–18cm
Poaceae – Cyperaceae – Plantago lanceolata
Arboreal values remain low but increase briefly at the end of the zone. Poaceae values decline slightly while Cyperaceae values increase. Herb taxa are well represented, particularly Plantago lanceolata and Potentilla type, as well as others including Achillea type, Lotus and Lactuceae. Calluna values decrease. Charcoal values decline.
Zone BYG4 18–4cm
Poaceae – Plantago lanceolata
Poaceae percentages increase and Cyperaceae percentages decrease. Herb pollen continues to be well represented. Arboreal pollen increases slightly, notably Pinus and Betula. Charcoal peaks at the end of the zone.

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