Pollen analysis and radiocarbon dating of late glacial and early flandrian sediments in North Wales
Detailed pollen analyses, together with analyses of deteriorated pollen and spores and lithological investigations, were carried out at four sites along an east-west transect of the mountains of north Wales. A total of twelve radiocarbon dates were obtained from critical horizons at the four sites investigated. Two of the pollen profiles (Clogwyngarreg in the west and Llyn Goddionduon in the east) provide a detailed record of vegetational and environmental change in the lowlands of north Wales during the Lateglacial (Late-Devensian lateglacial) and early Flandrian periods, while two other profiles (Cwm Cywion and Llyn Llydaw) provide a detailed record of early and mid Flandrian (postglacial) vegetational and environmental history in the uplands of north Wales. Radiocarbon dates from the base of the Lateglacial profiles suggest that the Late-Devensian ice-sheet had disappeared from the lowlands of north Wales by ÂŁ 13,500 B.P., and that by that time open habitat herbaceous taxa, including abundant Rumex sp. were colonizing the recently deglaciated ground. The initial pioneer grassland communities were gradually invaded by juniper and birch, but the development of birch scrub appears to have been sporadic, and
Ince, J.
Archaeology
Pollen analysis and radiocarbon dating of late glacial and early flandrian sediments in North Wales. Detailed pollen analyses, together with analyses of deteriorated pollen and spores and lithological investigations, were carried out at four sites along an east-west transect of the mountains of north Wales. A total of twelve radiocarbon dates were obtained from critical horizons at the four sites investigated. Two of the pollen profiles (Clogwyngarreg in the west and Llyn Goddionduon in the east) provide a detailed record of vegetational and environmental change in the lowlands of north Wales during the Lateglacial (Late-Devensian lateglacial) and early Flandrian periods, while two other profiles (Cwm Cywion and Llyn Llydaw) provide a detailed record of early and mid Flandrian (postglacial) vegetational and environmental history in the uplands of north Wales. Radiocarbon dates from the base of the Lateglacial profiles suggest that the Late-Devensian ice-sheet had disappeared from the lowlands of north Wales by ÂŁ 13,500 B.P., and that by that time open habitat herbaceous taxa, including abundant Rumex sp. were colonizing the recently deglaciated ground. The initial pioneer grassland communities were gradually invaded by juniper and birch, but the development of birch scrub appears to have been sporadic, and
pollen analysis radiocarbon_date late glacial early sediment north_wales detailed pollen analysis together analyse pollen investigation_carry site along east_west transect mountain north_wales total twelve radiocarbon_date obtain critical horizon site investigate pollen profile west east provide_detailed record vegetational environmental_change lowlands north_wales late early period profile provide_detailed record early_mid postglacial vegetational environmental_history upland north_wales radiocarbon_date base profile suggest late ice sheet disappear lowland north_wales time open habitat taxon include abundant recently ground initial pioneer grassland community gradually invade development appear sporadic