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Pollen profile RL305, Rotsee, Switzerland

Publication Date
DOI: 10.1594/pangaea.739749
  • Abies
  • Acer
  • Alnus
  • Artemisia
  • Betula
  • Botrychium
  • Campanulaceae
  • Caryophyllaceae
  • Centaurea Cyanus
  • Centaurea Nigra-Type
  • Centaurea Scabiosa
  • Chenopodiaceae-Type
  • Compositae Subfam
  • Asteroideae
  • Compositae Subfam
  • Cichorioideae
  • Corylus Avellana
  • Counted Exote
  • Cruciferae
  • Cyperaceae
  • Dryas Octopetala
  • Dryopteris Filix-Mas-Type
  • Ephedra Distachya-Type
  • Ephedra Fragilis-Type
  • Epilobium
  • Equisetum
  • Ericaceae
  • Fagus
  • Filipendula
  • Frangula Alnus
  • Fraxinus Excelsior
  • Gramineae
  • Gypsophila-Type
  • Hedera Helix
  • Helianthemum
  • Hippophae Rhamnoides
  • Ilex Aquifolium
  • Indeterminable: Unknown
  • Juniperus
  • Labiatae
  • Linum
  • Livingstone Piston Sampler
  • Lotus-Type
  • Mentha-Type
  • Monolete Fern Spores
  • Myriophyllum
  • Nuphar
  • Papilionaceae
  • Picea
  • Pinus
  • Plantago Lanceolata-Type
  • Plantago Major-Type
  • Pollen
  • Cf
  • Upland Herbs
  • Polygonum Bistorta
  • Polypodium
  • Populus
  • Potamogeton-Type
  • Quercus
  • Ranunculaceae
  • Rl305
  • Rosaceae
  • Rotsee
  • Switzerland
  • Rotseerl-305
  • Rubiaceae
  • Rumex-Type
  • Salix
  • Sanguisorba Officinalis
  • Saxifraga Oppositifolia-Type
  • Selaginella Selaginoides
  • Sphagnum
  • Thalictrum
  • Thelypteris Palustris
  • Tilia
  • Trapa Natans
  • Trifolium-Type
  • Typha Latifolia-Type
  • Ulmus
  • Umbelliferae
  • Urtica
  • Viburnum
  • Viscum


[RADIOCARBON, VOL 31, No. 3, 1989, P 795-804] ATMOSPHERIC RADIOCARBON AT THE END OF THE LAST GLACIAL: AN ESTIMATE BASED ON AMS RADIOCARBON DATES ON TERRESTRIAL MACROFOSSILS FROM LAKE SEDIMENTS HUGO ZBINDEN, MICHAEL ANDREE, HANS OESCHGER Physics Institute, University of Bern, Switzerland BRIGITTA AMMANN, ANDRE LOITER Systematic Geobotanic Institute, University of Bern, Switzerland GEORGES BONANI and WILLY WOLFLI Eidgenossische Technische Hochschule, Zurich, Switzerland ABSTRACT. The main purpose of this work is to reconstruct the atmospheric i14C in the glacial-postglacial transition, 14,000 -10,000 BP, a range not covered by the tree-ring calib- ration curve. We measured '4C/12C ratios on series of terrestrial macrofossils from sediments of two Swiss lakes. We selected exclusively plant remains of recognizable terrestrial origin that are not affected by hard water and thus reflect atmospheric 14C concentration. Due to the scarcity of such material, we used accelerator mass spectroscopy. Cores of two lakes were measured to eliminate local effects and to check the reproducibility of results. This required a reliable, 14C-independent correlation of the cores, obtained through local pollen zone bound- aries.14C ages were obtained as a function of the depth in the cores. If sedimentation rates are known, ages can be converted into i14C values. We also attempted estimating sedimentation rates; calculations are based on the Swedish varve chronology. Results were combined to form an entire data set. The Q14C curve shows an increase with time during the Allermd and decreases during Preboreal and Bdlling periods. Probabilities for these 14C variations are dis- cussed. INTRODUCTION Results discussed here are based on several sediment cores taken in two Swiss lakes, Lobsigensee (47°02'N, 7°18'E) 514m asl and Rotsee (47°09'N, 8°20'E) 419m asl. Both lakes have small, closed or almost closed basins and thus show undisturbed sedimentation with little allochthonous

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